New to pool ownership.

Hello,

I bought a house last fall and had a friend close my pool up for the winter for me. I am looking to open in up for the season in a couple weeks. I have never owned a pool. I have read through several thread and have found some very useful info. Thanks!. I have ordered a K-2006 test kit to see where the water is. I do see some green algae build up on the cheap black cover the is over the pool right now. I have in ground oval pool that I believe is close to 20,000 gallons.