Congratulations! Kinda. I mean, I know you're excited about this as you should be, but don't let that keep you from walking away if the prebuy finds anything that should be a deal killer.
Fly the wheel pants off of it! Aim for once a week minimum. You may save enough money in maintenance to pay for your avgas. Airplanes HATE to sit, and they get expensive when they do.
I see from the other thread you have a lot of 172 time, and a bit of 182 time. I'm not sure how that's gone for you so far, but landings are more difficult in the 182, and you need to be deliberate about holding the nosewheel off and letting it come down gently. A lot of CFIs will teach you to land with only 20 degrees of flaps, and it's easier to land that way, but learn to land with 40 and make that your standard practice.
IIRC, you're partway through instrument training. Use your plane for the rest. It'll slow you down just a hair, but it'll be worthwhile to get more dual in the plane as well as get used to slowing down, planning descents a little better, and working the extra knob.
What is the "half glass" and what autopilot do you have? Does it work?
Learn the plane inside and out. Read the maintenance logbooks and see what's been done to it before. Is the fuel flow accurate? What is its real world cruise speed? What are all the various modifications? Make checklists with all of the various AFMS items included (and make sure your POH is up to date while you're at it).
Once you're comfortable with the plane, do new things. Go on longer trips, land it on grass or other "unimproved" surfaces (do gravel BEFORE you paint it
), get used to how it performs with just you and how it performs fully loaded to max gross, and do what the 182 does best: A little bit of EVERYTHING.
Don't do anything in the first 50-100 hours/first year except mechanical stuff. After that, think about avionics next. If that autopilot doesn't work well and/or doesn't at least have altitude and heading hold, I'd be looking to do that next. You won't see most of the paint while you're sitting in it! A paint job on a 182 is likely minimum $20K these days, and it won't make the plane any faster/safer/better except for showing it off to others.
Most of all... Have fun and fly safe!