I'm glad you're pumped up, and I definitely see you making the 10k back within a short time, but I've got to say, that was a LOT of theory craft and number speculation.
You assume how many fliers 2 teenagers will pass out per day, you assume a response rate, you assume repeat business, you assume a customer per hour at a gas station (where people are going in for a coffee/donut or to get gas to on the way to work), you assume... a lot.
I don't doubt this will pan out to be a nice business, but just don't get too down if things don't play out as quickly or as well as you anticipate.
Things rarely go as planned when it comes to speculation, even for the most conservative numbers.
Edit: I saw someone mention that since this is a cash business (the gas station, anyway) you should be prepared to have employees steal from you. This is really easy to combat: get the SquareUp (It's a card reader for smart phones, there's others too, you may want to search for the best deal), buy a decent smart phone, and let the employee have it for the business and personal use. That way you can also accept credit/debit, less cash is available to steal, and the employee gets a nice perk (free phone/no phone bill while employed), it will make him less likely to betray you if you take care of him.
