Any recommendations and suggestions for a new upcoming officer in the army reserve?

Keep your employer informed of your training schedule. While the employer is required to support reservists by law. I had managers who looked at it like you volunteered and they did not care if I need to be off on a weekend UTA 5 or a two week drill. If they have the printed schedule well in advance makes this much smoother !

This gets asked often: https://www.rallypoint.com/command-post/new-officers-listen-up

Be prepared to drink from a fire house. It’s amazing how much you don’t know until you start to learn and then you truly realize how much you didn’t know. Be prepared for a ton of online training. One weekend a month is a lie. It’s going to be more than that even if you’re not running one of the shops for your unit. Embrace it. Enjoy it. It’s a lot of fun.

Be ready to go to DCC (direct commissioning course) and be in good physical shape when you get there. They will not PT you enough to get you in shape. You will again feel like you’re drinking from a fire hose at this training. It’s 4 weeks at fort sill, but it’s a blast! I loved it!

Get to know your NCOs in your unit. Introduce yourself. Listen to them. They know their jobs. They know their people. They will make you or break you.

Being a reservist/guard member is amazing. It’s a lot of work and at times I feel like balancing a personal life, civilian job, and your duties as an officer/military requirements is much harder than just being active duty, but it’s a great break from everyday civilian life too. I love drill weekends and getting to go to trainings.