first off if you dont know where to buy one from..then well, good luck.
Second of all, its so easy!!!
step 1. get working dumps ( try and buy all the dumps you can )

step 2. get the Jerm or msr206 software, and copy and paste track 2 and 1 where they belong

step 3. get some good plastics, or print your own with a good embosser Im fortunate to have a team with some team equipment aka tools..
step 4. buy marijuana (keeps the proccess going smooth)

step 5. smoke marijuana cause your done
step 6. enjoy your iphone 5S