Welcome to the board! First off get a manual, Honda ones are great but Cylmer ones are good to. With the manual you shoundn't have much of a problem. Get a gasket kit, I get mine from www.denniskirk.com but be sure to get one that comes with valve stem seals because they should be replaced, especially if you reseat the valves. Otherwise just look for parts that seem worn, scratches in the cylinder and pistion, ect. I would also replace the rings well you are in there, that is probably why it is smoking but once it is apart would will see if it needs anything else. And as always feel free to ask any other questions.
1984 Yamaha YT 60 Tri Zinger(current project)
1983 Yamaha YTM 200 (rear suspension kit)..... long term project
2004 BMW R1150R
1972 Honda CT 70
2007 Lifan 110