Outdoor Growing: Massachusetts?

I live in Massachusetts and i am going to grow Marijuana this spring. It is the 27th of March currently, and I am planning on planting a good variety of seeds in a forest near my house. I have never done this before, so any advice experienced growers can give me is greatly appreciated. I was thinking of going up there soon and picking out a spot. The forest is very large and very secluded for the most part. There is also a small stream that runs through it that i may be able to use for water. I am probably going to end up with about 30-40 seeds and i am going to try and plant as many as i can depending on space. I am hoping that i can plant these seeds by mid-late April, take care of them as best i can, and then see some results in August/September. I have never grown Marijuana before and I am really excited to do it. The idea of being able to take care of it and grow it yourself seems very appealing to me. And i will be able to sell much of it to my friends as well.

Thanks in advance