Was lucid for only time to do a RC

[hellohihello]

I was only lucid for a few seconds when I did a RC then I don't remember what happened . My first Lucid dream, two nights ago, I was able to do anything I wanted, as in I had full control. This dream Just disappeared when it started. It was a false awakening and I know for sure I didn't have any dreams prior to it. I am guessing it just takes practice but I am not sure how to stay awake if it only lasts a split second. Can anyone help me with this? I know how to control but I need a few more seconds to do that. Second. How can I control my self to wake up? Normally in a Nightmare I just open my eyes which is weird because my eyes are open in the dream,but this isn't a lucid dream. In a lucid dream is this the same? Third: what is a DC? Thanks for helping out the noob