So just recently was coming back because I am really bored with other games anyways,
I used to play horde but I realized on my alliance server I do not have any heirlooms in my collection tab
Am I missing something? Because I would like to start an alliance mage but my cloth heirlooms are on my horde servers.

If not then anyone know the typical ratio people sell gold on here? Can I just buy it on any alliance character on any server and transfer the gold onto my main alliance server via mail?

You must log on to the toon that has the heirloom items in order for them to be imported into the tab.

does it matter if its on a horde toon?

no it doesnt matter if its on another server or faction.