Those two lines on the tester have just declared me a father-to-be.

I am not worried. I am excited. An anxious sort of excitement.
I am about 30. We have dated for well over 6 years and there is no doubt that she is the one i intend to spend the rest of my life with.
I got two questions:
1. What are the absolute do's and dont's at this stage?
2. Engagement: I have put this off, waiting for that elusive perfect moment but i feel there is no better time than this. A few 'pointers' please?
Excelsior