When I used Photoshop, there was a feature to spell check but CSP does not have that.
So I will write out the sentences first in another program where I can spell/grammar check them. Then copy and paste them into CSP.
Photoshop had a better text wrap feature while CSP will sometimes cut off words right in the middle. While I don't like it, I do have to push ENTER at the end of lines to help wrap them properly.
Word bubbles are put on their own layer so that I can move/edit them if I don't like them. Starting out I did put them on the same layer as a the art and it was a bit obnoxious when it came to making changes. Usually I will place my text first before I start sketching so that I am not covering anything too important. It also allows me to rewrite things if bubbles get too big.