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I am sending a letter to Daniel Radcliffe and I requested a autograph and asked him to send the picture
Do I have to send a picture for him to sign it?
Do I need a special envelope for my letter?
This is my first sending off autograph My dad got me 2 books and 2 signs from Brian Jacques as he visited my dads work place before he went usa.

Thanks in advance

Daniel Radcliffe only sends preprints through the mail (via his agent). This means it's a copy. If you're ok with this, go ahead and write, otherwise consider waiting for him to appear on stage again.

Your envelope does not need to be special, though you will need to include a stamped return envelope.