Cricket/vinyl help please!!

Mariah

I was trying to make my own shirts with vinyl lettering and each time I print it the size that looks right after I stick it to my shirt it's very spread out and you can't read what I put on there! If I shrink it the letters will be to.small!

Am I missing something?

Wrong font?

Also, I wanted to print a picture on there as well (some flowers) but how do i do that?

Idk if that makes sense, but please help!!