This probably sounds stupid to you, but oh well.
How do you get a picture with a celebrity if you're unprepared? For example, you're just walking around somewhere and you spot a celebrity? I don't have a smartphone, all I have is a shitty slide phone. Don't tell me to bring my Nikon around because it's just too heavy and space consuming.
How do you ask them to get a picture? I'm kind of shy and I don't want to be awkward.
What do you get signed by them? Do you ask them to autograph a piece of paper or something? What items are good to be signed?
Read more: How to talk and what to do when you see a celebrity?