$100 in a week isnt much, but how is this the way you got into reptiles? The Lemonade stand profits for reptile pets? Minimum wage jobs would produce far more money for your time than the lemonade stand... Anyway, turning a profit on BP's from everything everyone on here has reported takes a while.
How much can you put in? If it's just from Lemonade stands then you likely wont be able to afford a large base of breeders in any morph at $100 a week.
Also if you are only 13 not many would be willing to enter into non-binding agreements (as stated before) for such large purchases. Are you intending to sell locally?
Also are you going to hire an accountant or do you know how to fill out self employment taxes for such things(equipment, expenses, etc)? (This also makes me curious how all of you do the taxes part... Hobby loss deductions so you dont have taxable hobby income?)
As a business person you will not be able to let your temper take over otherwise you'll get very little to no repeat business.