Welcome kaiern9999, you actually found a pretty good place to start with lucid dreaming. I hope I can help you with your problems, either way there's a lot of wise people wandering around .

As you said, you just started practising lucid dreaming, and most of the lucid dreams you have while you're a beginner happens right before waking up. My first lucid dream only lasted like 10 seconds before the room I was in started to vibrate and ended up crumbling. The more lucid dreams you have, the longer they will be, and so will be better your dream control. I'm going to leave you a few useful links at the end for you to take a look.

Remembering your RC's? I don't know if you meant your dreams, if not you're probably talking about remembering to do them, in that case my first answer would be the same for this.

That's not a problem, it would only be for WILD, but I don't either lie on my back because I find it quite unconfortable, so I can only stay that way for a few minutes. Again, that's not a problem.

Meditation is quite an useful tool, not only because, as you said, it will help you ''clean'' all the stuff that acumulates in your head during the day so you can be more relaxed, but because it will also help you set your intentions with lucid dreaming and awareness. Sivason did an awesome work with Dream Yoga, involving meditation techniques for lucid dreaming results, I suggest you to take a look but also be curious and find more information about meditation.

I took during a week vitamin B6 and it highly increased my awareness and made my dream more vivid. If you take it, remember not to take more than 50-100 mg / day, as it can cause nerve damage, but only with high doses.

Sivason Dream Yoga: Dream Yoga
Dream Recall: http://www.dreamviews.com/dream-sign...ompendium.html
Dream Control: http://www.dreamviews.com/dream-cont...-tutorial.html

Good luck!