Welcome! It's a great journey - lots of fun, and when you're finally in the 'roasting zone' it is well worth the effort.
Certainly your 9:45 to first crack (I aim for 12 mins generally) sounds pretty good for a first roast attempt - so you must have your gun settings pretty close! I haven't had any experience with the aeropress - but have read that they like the roast a little lighter. For espresso I drop my gun temp just before first crack then just after rolling first crack to give about 4-5 minutes to second crack - but depends what you're roasting for :-)
Look forward to hearing about your journey
Enjoy the ride!