Hi, and welcome to DV!

Most people here start with making a dream journal, and improving their dream recall. Take a look at some tutorials (DILD, MILD, WILD and the likes) and try getting yourself familiar with the terms because especially in the beginning it can be a bit hectic
As for the lucids ending really quickly, this is normal in the beginning. Some people get lucky and their first lucid lasts a few minutes, most tend to get booted out immediately To make them longer, read up on some stabilization tutorials, they're filled with tips and tricks on how to do just that. And ofcourse another thing, which will help with both prolonging and increasing frequency, is patience, perseverance and practice

Anyway, have fun