The PDF manual that comes with FCP explains about contours, but you don’t need to draw any contours. Just draw the letters in your graphics program to fill the space between guidelines that you can use to keep letters roughly the same propertions.
Copy the letter to the clipboard and paste it into the appropriate letter in your new font, in the font overview. Double-click to open the glyph edit window. There will be two contours for a normal A, three for a B, or only one for a C. If the letters are way too small in Font Creator, you may need to zoom out in your drawing program, and draw them the full size of the page. Just keep doing one letter until you figure out the suitable size.
The weight of the stroke is important. I assume that you can vary that in your drawing program. Don’t try to make your font too spindly. Font Creator doesn’t support hinting, so spindly fonts break up at small sizes. Try something more like Odana, Brush script, or Comic Sans rather than Palace Script.
Preview your single letter in Font Creator (F5) to see how it works at the sizes you intend to use it. Then you can decide to increase or decrease the stroke weight before you get too far.
If you look at some threads in the Gallery you can see that beginners are able to get good results with Font Creator. It is not quite as easy as falling off a log, but you can succeed without months of study and struggle.
Adjusting spacing, kerning, line-spacing, etc., is best left until you have mastered the basics of importing an image and scaling it to the right size. There is a lot more to Font Editing than meets the eye. Your thirty-day trial is just about long enough to learn the basics. Believe me, Font Creator is as easy as it gets, and it is a lot cheaper than the other Professional Font Editing packages like Fontlab or Fontographer. (I have used both Fontographer and Corel Draw to create Truetype Fonts, and I have a demo version of Fontlab).
If you want the bare minimum of hassle, just get your font done professionally. There are online services that don’t charge the earth. However, they also don’t deliver the personal satisfaction and attention to detail that creating your own font does.