Any tips for someone headed to their first unit?

It's like prison. Pick the biggest/strongest guy in the unit and fight him for dominance. :-) JK JK

Keep your eyes and ears open, pay attention to what is going on, volunteer when you can. Learn the system so you understand the things you need to do going forward.

In addition to what (~287550-maj-javier-rivera), SGT David A. 'Cowboy' Groth, SSG (Join to see) and [~1481154-msg-danny-mathers) and those others who responded in their threads said please add this - Don't rely on what someone else tells you is in a military regulation is become familiar with them. Some folks are what the navy calls "sea lawyers" (https://www.collinsdictionary.com/us/dictionary/english/sea-lawyer) and think they know, but have never taken the time actually look things up for themselves.

In the US Navy we have the SSIC (https://docplayer.net/7371362-Standard-subject-identification-code-ssic-manual.html), which is a well ordered index by topic code. If the Army has a similar manual become familiar with its structure. Of course make sure you are using the most UTD version. Learn early and often how to use such an index and how to stay up on Army-wide, Base-Wide and your individual commands guidance documents (aka written instructions). Set your mind to reading about one subject a week (humm 52 subjects a year). In this way, as you work toward promotion you NCOs and Officers will see your value because you will sharp with appropriate knowledge about important subjects.

Also, get familiar with Army-Cool (https://www.cool.army.mil/). Just as you are preparing to be 'professional' during your time in the Army, be preparing yourself for life after the Army regardless of when you leave the service. Gain both practical and academic skills, both will be useful to you!

Your 1st year will be very busy learning your craft, whatever that is. But, as you have free time take time to volunteer as well. Read to kids once a week, etc. You are a member of your community inside and out the base gates. Set an EXCELLENT example. You never know who knows you CO, XO, or SgtMaj in the community. It has been experience that sometime the CO may see you and someone in the community as something positive to say about one of their troops. I no of NO CO who does not well positive news about any of their troops. Be humble, but be RIGHT!!! Arrogance can get you through some things, but real leaders know their stuff and their actions, not their mouths speak for them. But, when you do speak, speak with confident authority.

Finally, if you need help ask!

Hydrate..

Along with all of the other great comments already posted, ensure that you are in the mindset of learning as much as you possibly can. You are at a point in your new career where you can focus on the fundamentals and not need to worry as much about other soldiers. As you develop become the soldier your unit won't know what to do without when you leave. If you can become irreplaceable, you have done your job. That goes for not just your first duty station but every place you go in the Army.

Attention!!! Forward ,March !Get with the program .

As my uncle to me (USAF retired) "Never volunteer" and see #7 from MAJ Javier Rivera

Yes, mouth closed, ears open.

Choose your friends wisely
Look and act like a Soldier when you report in. You only get one chance to make a first impression.
Be ready to be treated like the new guy.
Be ready for the goofy pranks.
Train and work hard show your ready for you promotion
Don't pickup any bad habits

There WILL be times life sucks. You're team members are sucking too. Don't whine or complain while you're performing your duties, it's okay afterwards, never during.

Also, read up on Infantry Rifle Platoon and Squad ops. When I was in it was FM 7-8. Now it looks like it is ATP 3-21.8. It is heckin simple to get Army Regs and Manuals nowadays. Get 'em, read 'em.

https://armypubs.army.mil/epubs/DR_pubs/DR_a/pdf/web/ATP%203-21x8%20FINAL%20WEB%20INCL%20C1.pdf