Welcome to the forum Jorge. After 20 years of sitting around the bike could require quite a bit of work to get it rideable and more importantly safe. The carbs will definitely need a strip, thorough ultrasonic clean and new rubber 'O'rings and gaskets fitting and setting up correctly. The fuel tank may need a very good clean out, especially if rusty. The tyres will most probably be hard, dry and cracked. The engine may be seized but if not it will require a good service, new spark plugs, oil filter etc etc etc. New air filter. Tappets re set. The engine oil seals may have gone hard and brittle which would cause leaks, if so, to replace some of these requires a total engine strip down. The fork oils seals may need changing. Front and rear brakes overhauled with new pads / shoes. The clutch may be seized. This lot is just for starters......shall i continue. On the other hand you may find she starts up 1st push of the button and no need for any work at all but, i doubt it. Best to do all the work yourself if you can, specialist mechanics in these old Hondas are very rare to find these days. Good luck