Ahh okay, that makes a lot of sense! Thank you for clarifying 
Yup, meditation and prayer are where I would start! An altar can be helpful but it isn’t fully required. I don’t know too much about Diana as a deity, but we do have some information about her here on the forum. I’d definitely recommend keeping a journal of your divination, meditation, and prayer sessions. This can help you find patterns and reveal messages that you may have missed during the regular day or during dreams!
Song to Diana, Goddess of the Hunt & the Moon