I am seeking to perform well as a commissioned officer. What advice can you offer to being an effective staff and line officer ?

Don't be afraid to ask for assistance. Learn to listen to your trusted NCOs.

You will get a thousand different answers. I will answer from the perspective of a Signaleer, and things I've learned along the way. Read ADP 6-22, and 7-0 to start. Know signal flow and the capabilities and limitations of your equipment in order to employ it correctly, but understand that your job as a 25A is not to be a technical expert. If you are in the weeds configuring equipment instead of leading and managing your troops something is wrong. Understand the unit's mission and how you fit into it. Make sure you can write and write well-reference AR 25-50 constantly. You need to understand evaluations, and counseling; and if you are fortunate enough to be a Platoon Leader you need to understand property accountability (AR 735-5 and 710-2). Trust, but verify. Do not solely rely on email to communicate. Always try to improve your unit; you do this by improving yourself, your troops, and your processes. If you don't know the answer, and you can't find it, don't be afraid to ask; but make the effort to educate yourself first. If you bring up a problem, you should have a solution or mitigation plan as well. Seek out a mentor; this can be anyone who can develop you whether it be a Senior NCO, Officer, or Civilian.

CPT (Join to see) there is a ton of RP content on this topic. Here is a link to a similar discussion with links to,other similar discussions. https://www.rallypoint.com/answers/what-is-some-advice-that-you-would-give-to-a-brand-new-lt?urlhash=2492830