i was planning to buy a new bearing, but do they have different sizes? (sure answer pls......)
99$ of skateboard trucks have an 8mm axle and use 608 bearings. Only a few trucks have 10mm axles, usually used for large wheels on longboards. Unless is says 10mm axles on the package, they are the standard bearings.
Lets see... For a good deck I'd check out Plan B, ZooYork, or Zero they're all 3 pretty good brands. For trucks u have either Silver or Independent, I think Silver is better but that's my opinion. For bearings I'd go with either Bones or FKD saw blade. For wheels Bones would be a good buy as for grip tape u can either check out mob or check out Torey Pudwill's new brand called Grizzly Grip but it just came out recently so it may be hard to find in stores!