Need help with many questions on new Vanda given to me!!!

[saraisSET]

I've been given what I believe to be a Terete Vanda since it has pencil like leaves. I was given the instructions to "leave it out in the sun and let it get rain water". I REALLY have no clue what this orchid needs. It was given to me in a large pot with regular potting soil and mulch on top. I'm scared to death it's going to get overwatered. It also has some dark brown sort of scaly areas on the leaves and stalk. I don't want to change its conditions until I'm sure I know what I'm doing. I hope you can help me! Here's a picture!



Thanks!

Sara