I agree with the recommendation to try gear out before you buy it.
Wing Size: are you going to do any cold water diving, I am in the NE so I would use between a 30-38 lb wing for single tank which would give me more than enough lift for whatever I might need it for. If you are only going to dive in FL, than something in a 27lb wing would be fine. I am the type of person that always tries to buy gear that is versatile and can be used in a wide array of conditions so I would go the larger wing regardless.
Computers: I hate console computers and think the proplus is not the best bang for the buck and borderline waste (no gas switching, large price tag for what it does). I dive a Geo 2 and love it (you can get it online for $225 used, $280 on sale). For a first computer, I recommend a simple wrist dive computer that has gauge mode so you can use it as a backup should you go into tech. So are so many threads that cover the first computer I will let you do the searching.
Try out plenty of gear. I was recently looking for new regs and I borrowed a whole bunch from different friends. I was actually seriously looking at Atomic M1 or a Z2. I breathed a friends Z2 and while it was ok, it was nothing special in my book. The best regulators I have breathed have been Apeks XTX 200, 100, and 50's. So I got the Apeks XTX100s from Leisure pro. Don't get me wrong Z2s are excellent regulators and I am sure that some people will disagree with me, but I personally tried both regulators and ​I think the Apeks were better breathers.
If you take your time with gear purchases, you won't find yourself re-buying the same items.