Hey Salmon,
I thought I would be the sensation here (a talking lobster), now you are trying to steal my show. Well, so be it.
Since you are planning to use a 10 cent stop I have to assume you will want to trade more than 3 times per week. Unfortunately, the PDT rules will not allow you to do that. You need $25000 in your account in order to trade without those restrictions.
Other than that, 100 share lots should be ok for what you want to accomplish (correct me if I'm wrong): Learn how to day trade on a rather short term basis the only way one can, which is doing live trades.
I would stick to 100 share trades until you are really comfortable and consistently profitable (which might take years, but probably no less than 6 months) and don't worry about losing a few hundred bucks. Unless you are a resident of Laos or Pakistan you should be able to save up another $2000 in a few weeks in case you blow out your first account. It's just the price most of us have to pay in order to become profitable eventually.
But! And it's a big butt! It is NOT necessary to risk $25000 in order to learn how to trade. Not anymore. Not in this environment with brokers like IB. That's why the PDT rule was outdated the minute it became active.
Ideally, you would have $30000 in your account so you don't have to worry about PDT, but as soon as you get down to 25000 (which is where PDT kicks in anyway) you stop trading, maybe even withdraw what's left and save up another few thousand to start again.