Don’t live with anybody who doesn’t support your work. Very important.
And read a lot. Don’t be afraid to read or of being influenced by what you read. You’re more influenced by the voice of childhood than you are by some poet you’re reading.
The last piece of advice is to keep a paper and pencil in your pocket at all times, especially if you’re a poet. But even if you’re a prose writer, you have to write things down when they come to you, or you lose them, and they’re gone forever. Of course, most of them are stupid, so it doesn’t matter. But in case they’re the thing that solves the problem for the story or the poem or whatever, you’d better keep a pencil and a paper in your pocket. I gave this big advice in a talk, and then about three hours later I told a student I really liked his work and asked how I could get in touch with him. He said he would give me his name and address. I looked in my pocket, and I didn’t have any pencil or paper.