Congrats on your dream
For my first lucid dream I got so excited I instantly woke up. For my first 3 dreams I wasn't really able to stay in the dream much longer than 30seconds-1minute. I had trouble stabilizing and staying lucid without forgetting or just waking up.

What helped me the most was to:
#1. Concentrate on the scenery and enjoy it
#2 Slowly walking around and thinking about the things I see
#3 Never close my eyes, (Whenever I close them I wake up)
and #4 is to have some sort of goal and remind myself of it

For me #2 and #3 are the most important. I hope that helped, it took me a while to find what works for me and you'll probably have to go through the same process. Good luck!