hey spindext, i'm also a toy so i understand you, i'm sure you have limited space to work with, so find an abandoned house or fabric etc. and take some some chalk and write with on the wall, i know it sounds stupid,but it helps in the beginning cuz you can clean it up and do it again and again,
and here's another advice draw on paper as much as you can ,i've used tones of printer paper, just to exercise my tags, do the same