Suzuki R125 - Need help

Hi r/motorcycles I need your help !

I just got a Suzuki RM 125 1984ish owner did not know the exact year.

Owner said engine is running just fine arround, 80 working hours without changing the cylinder or anything else.

Overall the bike is in rough condition I would say.. I add pictures so you can see it yourself.

What should I do before I try to start her up ?

Album link: http://imgur.com/a/cAqBJ