If i would be you i would start off something simpler, gift card game is played out and it attractes cashiers attention, specially if theres any other symptoms of fraud while you getting them, like 3 dips or a card with no chip(101)
I dont know about usa but here in canada most of us
started with swipping cigarette cartons all day. you will get to
make some money and at the same time discover your bins. Also
you will be able to connect with some corner store owner who will
be ready to buy you some stuff now and in the future