Ok, so this is what I would have written.
Dear JimBobJoeJeff,
Hey, Jimbobjoejeff, I hope you're doing ok i've missed you so much and been kinda homesick. here in Ulaanbaatar it is SO cold one day it was -4 degrees and one of my roommates almost got frostbite. I usally have to wear a lot of clothes and big coats. honestly kind of like it here the snow is so beautiful and there's a city that reminds me of a little version of New York. really the only thing that I don't like is the market beacause i have my warm house to go outside. You should really come and visit i really think you would like it.
Your friend,
bob
hope this helps!!