I am new to decorating but the two cakes I have done so far has business coming my way.  I want to know what kind of piping tip is good for writing (shopping at hobby lobby wilton brand) and how do i thin out buttercream icing to write on a cake HELP!!!!

Tip 2 or 3, and you can just add water to thin.

I write with tip #4 and two-tone it so the writing looks like it's from a smaller tip than it is (like white, mixed with a coordinating color), and it's easier on the hand plus no worries about clogs.  Thinning with water works fine, or you can thin with piping gel.

AGood idea ladies thanks for the tip LOL