Can I use any Canadian Stamp or are there specific stamps for sending to the United States?

Hello, I am somewhat new to the autograph collecting game but I have had a decent amount of success so far. But with that being said, I have never attempted to send anything outside the US. That’s where I need some advice or help. Which stamps do I use? Do I need to fill out a Customs form. Does t...

Sent two Photos along with a “Self Addressed Stamped Photo Mailer” to Thom Matthews on March 6th 2018 and received them back on April 3rd, 2018. Address Used: Thom Mathews Hammer and Trowel Builders Inc. 7365 Greenbush Avenue North Hollywood, CA 91605 USA http://surfmypictures.com/photo/46ca691...