King's Quest IV!
I used the manuals that came with the computer mostly. Started making a little game with a city constructed of ASCII characters and one could enter the various buildings. The nightclub had a flashing sign. Once you enter, a song played that I composed. All very exciting xD One of the reasons I wouldn't want to get rid of the computer. At the library I think I found a book on BASIC to help me. In college I did a course on Visual BASIC, glad to see it was mostly the same idea.
The 90s had their own fun though, like blowing into game cartridges to make them work. And AOL dialup.