First Time Trying to get an autograph...

[Sovereign]

And i really want Kate Beckinsales, but i live in the USA. I dont send out much mail, let alone things about sending certain things to the UK. So i need to know exactly what to put in what size envelope, and other things so...
1. What size envelope?
2. What should the letter say?
3. Should the letter be written?
4. What else, other than the letter, do i need in the envelope?
5. How do i ship it to the UK so they can send it back?
6. I think you need a picture in the envelope, where should i get a good sized one? (How can i print it out and such)

thank you so much

[Sovereign]

^^ so i send one big envelope with the smaller SASE with the UK stamps on them?
and is there any way that i can have it so i dont have to buy UK stamps? like would IRCs work?

[Wordsworth]

Yes, the SASE should have stamps on it for the return and it should be included in the larger envelope. It is my understanding the UK stamps are easier for the celebrity to deal with than IRCs. I don't know if it's true but anything that's easier for the celebrity to return the signed photo is better.