This question is kind of like how long is a piece of string, but i will try and help,
Envelope depends is you are sending photos and how pic they are, i use A5 usaully
make sure you send a SASE inside the same size too, or if sending overseas include IRC

Its up to you wheter you want to send your own Photos/dvd/cd/posters sleeves etc.. for them to sign, and just politely ask at the end of your letter is they wouldnt mind signing the enclosed items for you,
if you dont send anything, just ask them politely to send you there autograph, most people have photos, which they use to send out signed, but most people like to send there own so they dont get the same back as everyone else,

To get it read, mmm! i usaully use nice writing paper, either bright colours, sometimes i add stickers do doodles, just tell them a bit about why you like them and also you could include a little something about you,

its as easy as that and then just wait... and wait... and wait.... then bingo!

PS this is in the wrong forum, should be in collecting help

Typically I just send out a normal size envelope with a letter. I only send out an 8x10 envelope with a picture if I see a success in which somebody sent a picture and got it back signed.

i am planning to try to collect many autographs and make a portfolio, i was wondering if you guys have any tips for me.... like what kinda envelop i should use? do i send them a picture of them and ask them to sign it? any tips on how to get it read??? i am new at all this. I am also aware that it says i am a collector since 2009 but i signed up yesterday
thanks so much,
Gabzthegreat