First of all, welcome to Dreamviews!

You seemed to go pretty far for a first attempt. Yes, you were probably facing the beggining of Sleep Paralysis.

The images you saw are the hallucinaitons that will then compose a dream. I risk saying that you indeed got overexcited. But there's always a second chance

Best of luck on your WILDs. There's not much else you can do, but keep your relaxed mind and wait until you believe to be in full sleep paralysis. When so, you should just move, even if you believe it will ruin your attempt: high chances are you'll just move your dream body

For advice, check the tutorials: they exlain all that's needed for a WILD.

Finally, if you have any other questions, shoot!