Help! Organization issues!

Help! Organization issues!

Can anyone give me some tips on how to organize penpal stuff? I need to figure out how to save letters, stationary, stickers, pens, and basically all the materials! i can't seem to come up with anything other than all my notepads and a few pens stuffed into a shoe box! At the moment, I have all my letters put in the bottom drawer of a plastic set of drawers. And also, I need some bedroom re-organizing help! I'll be getting a few new fish tanks, some small betta tanks as well as 2-3 tanks the size of the goldfish tank. here are current photos:
Am I getting a green thumb?

Am I getting a green thumb?

Apartment in a little town in Germany

Apartment in a little town in Germany

Guessing garden check-in

Guessing garden check-in

what kind of chestnuts????

what kind of chestnuts????

dining area help!

dining area help!

My room

My room