Kerning is the last thing to do with handwriting fonts. The first thing is the get the side-bearings right.
As you’re discovering, font editing is not a trivial thing. Stay with it. You can get good results within a reasonable time-frame, but not in just a few days. And you first have to learn how to use the program. The next version of FontCreator will make manual kerning easier. Autokerning can be adjusted to give more/fewer kerning pairs and tighter/looser kerning by adjusting the white space value. Import from file is the easiest method.