Probably too late now, but you don't want to start it without being too cautious first. I'd take of the coil lead and crank it over till the oil light goes out, then connect it back up, that way you know you'll have good oil pressure and the engine won't instantly start from o to 900 rpm after 4 years with no oil.
But I'd defo take it to a specialist, but if your hell bent on doing it yourself i'd change the plugs, which cost about a tenner, and drain the fuel, or dilute with alot of new fuel if the level is low enough. It SHOULD start if there isn't a problem elsewhere.

Your probably better off putting up a post on here asking if there is anyone local to you who can have a look, for free, and without sounding too much of a twat it doesn't really seem that you know where to start, so you've nothing to lose really.