Mk5 Fiesta 5dr Project

Bought myself a little project fiesta, its a v reg phase 2 in a light green colour, paid £100 quid from my uncles friend obviously the car as a few problems, 1) the middle section of the exhaust was snapped so i sourced a cheap middle section from euro car parts for £12.49 and fitted it sounds alot better the baffles in the back box as fallen apart sounds like i got a cherry bomb on the beast, 2) when i picked up the car the passenger rear wheel was locked on and the owner told me it was the wheel bearing, so i removed the hub when i had the car recovered to my mums house and the rear wheel bearing was smashed to bits, so i removed the bits of bearing that was on the rear shaft and bought another bearing but am struggling to fit it *some help would be great* its as alloy wheels fitted dont get me wrong its not brand new so it as its scabs,...some advice on what to do with it would be appreciated cheers