Look at Janns Netcraft for some sizing charts and instructions.
http://www.jannsnetcraft.com/content/make_fishing_lures.htm
For trout I mainly use French blades in size 0, 1, 2 & 3. The finished weights on the Janns sheet are a good guide. .024 is plenty for trout. Silver with a little orange or red prism tape has been killer for me.
For SM bass I use 2 & 3 size blades and they are great for river SM. I've caught river Pike, Catfish and SM on these.
Also fingernail polish on bullet weights makes cheap bodies.
bill