To be honest, Bonaparte1812, the time that you go to sleep has absolutely no impact on your lucidity. As long as you can get 6+ hours of sleep, you’re very much well qualified.
What sleep position? The most comfortable position you can find. Despite what many claim, you don’t need to be on your back or in some awkward position to lucid dream. No matter what position you’re in, you will enter SP (consciously or not) and you will have dreams. So, whatever you want!
For the techniques bit, that’s the deciding part. You have to just look around and see what fits you. If you don’t mind my suggesting, I highly recommend checking out a software I made at the beginning of the year. It’s basically a two week conditional course that not only familiarizes you with several techniques, but it also provides an exceptional amount of lucidity. You can read more about it (infinity) and download it at the link below:
[url][software] Infinity - PDF Available]
If you’re not up for that, then I suggest you just starting out slow. Try to get into the mindset of performing RC’s in a routine based fashion. I also recommend checking out using the Hand Technique prior to sleeping (used in infinity as well). If you have no idea what or how to do this, I have an online technique library over at my site. Click here and then click on “Techniques” on the navbar.
Hopefully some or all of that helped!