As for your embouchure, do what feels right at the moment. Keep the corners of your lips tight, keep your throat relaxed and just blow. Don't try and "push" the note out by squeezing the trumpet on your face. Patience is key. Don't run before you can walk. Long low notes to start with.
And the most important thing you can do is ENJOY IT! :)
Hope this helps in some way and good luck with it. Oh, and welcome! :)