Making clay pots? i'm making clay pots. i need lend a hand on how...

i'm making clay pots. i need lend a hand on how to make measurements. i want to form a small one and a big one. the small pot has to fit inside the big pot.
Garden landscape communities/forums and facilitate?
Answers:    You may relish looking at http://42explorepottery.com
I hope I didn't get the site address wrong, but if I did, explore for pottery on Google. Good luck.