ok thanks to all of you for your help!

wait so would you put 2 or 3 on the SASE or the initial envelope, or both? lol

ok so a friend and i decided to try and start up this hobby. ive been reading through the collecting help topics and was wondering if someone could clarify this for me- i'm planning on sending a 4 1/8 x 9 1/2 envelope containing: a letter, a 4x6 photo to be signed, and another envelope (same size fo...