Hi!
I have a number of flower pressing tutorials on my blog that might help you, including what flowers tend to press well with the microwave flower press that I use, called the Microfleur. I tend to primarily use the Microfleur because it's fast, and it preserves the brilliant colors of the flowers better than traditional methods.
Also, there is a pressed flower group at yahoo you might consider joining - they have some good info in their archives for beginning flower pressers.
As far as frames, I started out by purchasing frames on Ebay, however now I purchase my frames from americanframe.com.

Hope this helps! Happy Pressing!

Elizabeth

Here is a link that might be useful: Elizabeth's Flowers Pressed Flower Tutorials

I went on line and bought a Microfleur microwave flower press. It's pretty easy. You just have to watch that you don't do it to long. About 15-20 seconds. I start out less and do more if needed....