Wotcha and welcome - we have an impreza buyers guide as a sticky, on tapatalk at the moment so I have no chance of finding it ☺ but im someone will be along shortly to point you in right direction. But with the hatch weak points are front top mounts rear arches have a lip in side that collects crud, paint on jnterior door trim is thin so can chip easily so use that to knock price down but it is an easy fix to take out and respray. Original exhaust is mild steel so check if that needs doing. Check for even tyre wear and budget for a 4 wheel alignment check for peace of mind £65. Keep us posted as to progress and feel free to get stuck in - all friendly on here