Did you found any place where they have nice models of letters to get some inspiration and pick the ones I like? I just did a quick search but did not found any satisfying results yet.
I did; I drew inspiration from a very wide variety of historical scripts. I am actually documenting the whole thing, but it grows too fast for me to get it all into the computer. Some day I'll publish it, though.
Back in high school tried doing this by printing out the alphabet with a font I liked, and could be written without too much hassle. Then I tried to imitate this, with success for a few month but it didn't last as my style changed.
I recommend you should check out http://medievalwriting.50megs.com as a good first step for inspiration.