I’m taking a Platoon in a couple days and signing for a Stryker Plt’s worth of equipment. What advice, do’s and don’ts does everyone have?

Do a touch-count inventory. Physically touch (if possible) every single item you are signing for. Don't just accept the carton, unless it is sealed, and the right weight.

If you don't know about Supply Discipline, take the time and work directly with your 92Y. You are signing for everything, so you need to have a working knowledge of what you have. Knowing supply will help you immensely in the future, in any command assignment you take.
A little "obsessive - compulsive" is a good thing. You will be sub-hand receipting everything, but you need to know what you are getting back, have your Supply NCO verify, but you need to confirm.
Don't take the word of others for granted, don't act like you are questioning their integrity, but verify anyway.
I have never been a 92Y, but I have been in plenty of units that didn't have one, so, baptism by fire, I had to learn the job. That included knowing where the hand-receipts are located, and how often you need to do a layout. BII is easy to discount, since part of it is expendable. Other units co-located with you may try to "acquire" missing equipment you have, so you need to make sure your Soldiers are securing it.
Of all of my duties, supply took the most time. So, you need to have a trustworthy 92Y.

Verify all equipment. If something is in maintenance make sure it is really there and verify when it’s going to be repaired and returned. If they say it is unrepairable get it off your books and a new one ordered. Talk to all of your people make sure they are all MOS Qualified and that those who aren’t are scheduled for the schools that need to be qualified

If you can’t touch it or see it, then they don’t have it. I watched a Signal Cpt take a HUGE statement of. Harvest for missing equipment.
Sign it all down to your NCO’s

Ensure you know all the assigned BII that comes with it. When you sign for it you are also signing for all the BII

O.k. sir, I was signed for a ton of stuff. All they way up to Battalion property. Here's my advice: Get with your Supply Sergeant. Make sure you know how to identify each piece of property by the manuel. The main component isn't usually the issue. It's all the BII that kill you. And take as much time with your layouts. Rushing to sign for stuff can lead to bad things. Eyes on is a must. If you don't see it, consider that it doesn't exist yet.

Inventory will make or break your bank account. And possibly your rank. I have seen officers delegate inventory to NCOs and junior enlisted, without the officer present. If everything is accounted for you look great, if not its your a** in the wind. Great officers have hit big bumps in their career because they were missing hundreds of thousands of dollars worth of equipment and no proof of loss. By the same token, I have done inventory with officers who cared about their careers enough to hit that supply room with those who volunteer (or voluntold) to help.

Make your inventory an airtight process. If your hand receipt has a serial number for an item as 123456, but the 6 looks like an 8, you need some way to cover yourself. And the best way I have seen that is have multiple copies of a receipt for yourself. Get another pair of eyeballs on a SN or a number you aren't sure about. I have seen older COs and officers whose vision was catching up to their age and needed to be sure what they had is what they were signing for. Serial numbers get damaged. NSN numbers change from year to year. Descriptions change.

Insist on a complete layout of EVERY item of equipment for inspection/inventory, and that every sub hand receipt holder be present for the inspection/inventory, and insist that those be immediately updated as you sign yours.
*Get this on the training schedule, ensure the supply NCO is available, and have any appts rescheduled for key personnel. Have an inclement weather plan.
*Obtain a copy of TM 9-6920-916-10, and become the PLTs SME on it. Initially, KNOW 2.1.1 Equipment Inventory and Inspection Notes Inventory and inspect equipment prior to installation to ensure you have all equipment required and that it is serviceable. Refer to Table 2-2 (MILES XXI CVS STRYKER COMMON KIT (ALL VARIANTS), 2031790-1) and Table 2-3 (ICV, CV, RV and FSV SERIES “DELTA” VEHICLE KIT). Use the inspection procedures described in Appendix C.
*Same for any other items of equipment.*
*Compare your hand receipt to what supply has on the property book, before you inspect or sign.
*Check keys with key control logs.
*If you can't physically place your hands on it, in general, it's short.
*If someone claims an item is on order, insist on the proper documentation, annotate it, and continue to follow up until it comes in.
*Take the PBO WO in your current unit to lunch and ask advice on inventory/inspection, property book docs, what to check, pitfalls, etc.
*Obtain current property regulations and pamphlets and read them cover to cover, and understand the different liabilities with regard to property. Just because you don't sign for something doesn't mean you're not liable for it.
*Coordinate with a PL in a different unit for hands on time with the equipment you'll be signing for so you are familiar enough not to have to keep referring to the TMs. If time and equipment availability permit, go through the inspection/inventory referenced above. Same for all equipment.
*This is the first look your NCOs and Soldiers will have of you. Be professional, be organized, stay on task, be the SME on what equipment you're supposed to have and appropriate supply regulations, have copies of the TMs, supply regs/pams, and a working surface.

Yup. Double check ....!but do it by the numbers and by the book. Fire team leader to Squad leader to platoon sgt to company gunny ..... then inspect it

Get and keep a hand receipt for every piece you give or turn over to someone else .