I bought a 07 Recon, it needs work

I came across this from a guy who was needing money bad, I ended up getting it for $450. Prior to buying I knew about it not pulling in 5th gear, it smokes, electric start issue, missing a front headlight and rear axle issue. Today I took the seat off since I plan on cleaning the carb, it doesnt want to idle. When I got the seat off I noticed the top of the engine was oily and it also appears to be missing a couple bolts, one of them was also loose.
Click the image to open in full size.
Click the image to open in full size.

This is the left rear axle
Click the image to open in full size.

I also do not know how to get this thing in reverse, I would appreciate any help I can get from the members here. I dont mind spending some money on this but I would like to try to do most stuff myself if possible. I havent really worked on atvs/dirtbikes other than carbs so my experience is limited however I am not afraid to learn or scared to try.

The plastics are complete and not busted up but they are all scuffed up, is there anything I can do to make them look better? The frame is also scuffed up all over, I wouldnt mind painting it(spray paint nothing fancy). Any tips on the plastics and frame/rack would be greatly appreciated as well.

Click the image to open in full size.