Don't worry mate, all these things can be fixed!
( a) Wheel wobble - most likely warped discs on the front, though could be a sticky caliper - change the discs if still present after your wheel balance. I've had the same mate, there are loads of guides on how to do it yourself on here. It's an hours work.
( B) Gritty brakes - probably worn pads. Easy fix
( c) Key fob - Driving with the master at all times is fine!!!! The key's are made for using, that's why they have buttons on to open the doors! There are also guides on how to re-programme the remotes on here! 2 minute fix.
Get these things done and you're away!
Good luck mate, keep posting, we are here to help each other and get some pics up! ;)