For good humorous free wedding toasts , start by introducing yourself and who you are to the bride. If she has a good sense of humor, you can tell a funny story about you two, or her and the groom (as long as it's in good taste and isn't too embarrassing). 

I find it kind of annoying when Maids of Honor and Best Men don't even mention the new spouse or that they are happy for their new marriage. Ask everyone to please raise your glass in honor of this wonderful new couple and 'clink'. That's it! Don't make it too long, sappy, or uncomfortable/embarrassing. Good luck!