Hey to all - hope you don't mind giving a newbie some help over here

After much looking around, I'm looking at getting a 3 door Golf Mk2 16v Gti - only trouble is I've no idea what age I should be looking at. Is there anything i'll need to consider regarding age - eg. difficulties with certain modifications, known problems/issues, or things I should be looking to avoid etc...
Any help would be gladly appreciated

~Drew