First of all :welcome2:
It all depends on how much you want to spend. Do you want one that needs nothing doing to it so that you can just get in and play, or do you want one at a reasonable price that might need a bit of work doing to it?
Have you any experience of fixing and maintaining Landies ... or anything else?
For a quick guide, if you want someone to give it the once over, you could take it to an MoT station and ask their advice.
OSD