I am a beginner, I took areial classes last semester, two hours everyday for five months. Then I graduated and did NOTHING for six months. Lost a lot of strength and am just getting back "in the game" now. I only have classes once a week, for an hour so it's much different, and has been harder to get back to where I was. I want to get silks and use them outside since I have very low ceilings.

I know nothing about rigging, where to hang them, what type of tree, or anything really. Any advice would help. Thanks!

I don't know where you are located, but this is an international site. There isn't much on Google, tried there. The only thing I can suggest is ask your teacher from last semester where to buy and safe place to use them.

Using them outside may be a problem. Trees are no good because the rough bark will rip the silk, making it a dangerous adventure.