So to help all of you who don't really know where to start here are some tips.
Once you have decided you are interested in Snail Mail there are a few things that you need to consider. First of all if you are under 16 I highly recommend you ask your parents first. You are giving your address out to people who are almost complete strangers and it's always best to get them on side.
Secondly you need to consider the costs. Snail Mail is a fairly cheap hobby compared to other activities however, it does have a lot of hidden costs. Decide how many Pen Pals you would like based on how much you are willing to spend bearing in mind the average letter costs about £1 to send air mail ( 1.10 euro or $1.10).
Thirdly sign up to a reliable website. I use http://www.interpals.net and I highly recommend it. I wouldn't go anywhere else! Also in this step you should decide if you want to incorporate a language exchange. If you speak a second language it's really helpful to write letters in your second language, to a native, to build confidence in the language.
Fourthly contact people from the country you wish to write to. If you use interpals it will tell you if that person is interested in Snail Mail or not. Because you haven't Snail Mailed before people may want to talk to you a bit before they give you their address to make sure you are who you say you are.
Fifthly, here's the fun part! Either write to your new Pen Pal or wait for the letter! When you are waiting for your first letter it does feel like every second is an hour long, but never fear it will arrive before you know it!
Finally, when you receive your first letter reply back promptly! The best Pen Pals are the ones that reply quickly and are never boring so keep that in mind. Don't feel pressurised to write back that day though nothing is compulsory!
I hope these steps help! If anyone one has any further questions please feel free to leave a comment here or email your comment to firstname.lastname@example.org and I shall reply as soon as possible!