What is the smallest size of gauges I can get for plugs?

You can start getting plugs from a 16 g but remember to go by each size... I gauged my ear from a 0 to a 1/2 inch and completely blew my ear our. It wasn't pretty... So def... I think ears are pierced at a 18 or a 16... Either way you can probably start with a 14, then 12, 10, 8, etc. Until you get to the side you desire. Also... I'd recommend cleaning your ears with bactine until they heal each time you gauge. Ive used that for all of my piercings and it worked alot better than anything else. AND FINALLY if possible buy your gauges online... If you go to hot topic or whatever they charge like 20 bucks a pair... Many places online charge a few bucks depending on the material. Sure they have shipping fee's... But typically it's still a way better deal... Try piercedfish.com for jewelry