I use a mixture of E.B Stone "Edna's Best" potting soil and E.B Stone "Planting Compost." It has all the same ingredients as Fox Farms soil but is MUCH cheaper. Avoid any soil with the "green beads" as they can burn the roots within the pot. I also add some Perlite that I find especially beneficial for starting the baby bands like you will get from Heirloom. It aids in preventing soil compaction and allows the plant to easily spread its newly forming root system. Above all, you want good drainage. Miniatures, I've found out, need a much larger pot than one would think. I like the plain old terracotta pots from Home Depot, 5 gallons should work well for you. If you want a more ornamental pot, make sure you check Marshals/TJMaxx/Ross...I've had very good luck there!

Heirloom bands need some special initial care, but I have had great luck with them. They just take some patience. If you order minis from them, make sure you get a "Tennessee" or get on the waiting list for one. It's exceptional and even has a very good tea fragrance. I could rave about it all day.

Good luck, and do keep us posted!
"Tennessee"

Any good quality potting soil will work just fine. Just be sure it is potting soil and not garden or top soil.