Recommended sleeping position: I could go very in-depth with this. Generally, the one you find most comfortable is best. However, sleeping in an uncomfortable possition may also help you in some ways, sounds daft I know. Eg: I have the most vivid dreams when I am on my back, this is also when I am more lucid, however I cannot get comfortable on my back to fall asleep but did have a successful wild this way.
So all in all, it is best to try several possitions over the course of several nights and see which you get the best results with.
Recommended food/drink before trying to LD: Different foods for different people, some say bananas but these don’t work for me. I have alot of success with Cheshire cheese though, if I eat it within an hour before bed I have alot of vivid dreams with good recall upto five per-night so far, when I have used it over the past two weeks.
But again, try different things some will give you better results than they might for other people.
Recommended method for LD ing for begginers: First off, keep a dream journal. This helps with your recal, always a good starting point. For begginers, reality checks are good, this is something you will continue doing daily for as long as you wish, if it works for you then keep on doing them.
With the other methods like WILD/MILD/DILD/WBTB etc. I would suggest reading up on them all and trying one for a set amount of time. If you have great results then keep on with that method or switch to another method for the same length of time (6-14days per method) - Writing down your dreams and other notes and see which gives you the best results, then focus on those methods and maybe combine them.
Best state of mind before going to sleep/in bed: I would say most states have their own advantages and disadvnatages, but generally the happier you are the better results you are likely to have.
Stress can seriously deminish your recall and LD ability, so if you are stressed alot you may want to try some meditation before bed to wind down and relax.
Recommended routines to follow (e.g. dream journal): DJ would be the most important IMO as recall is the big kicker, where’s the fun in having an LD if you don’t remember anything when you wake up? DJs can help improve your recall so deffinately a must.
A good sleep routine. This works for both insomniacs and LDing, have a set routine for bedtime. Whether it’s as simple as turning off the tv, using the bathroom/shower, getting a last drink and getting into bed. A sleep routine will help get your body and mind relaxed and ready for bed which means methods like WILD and HI are much easier to do as you are more relaxed and bed ready.
anything else I’ve missed? As with all things in life, Possitive Mental Attittude! The more possitive you are, the greater your success. Negative thoughts and feelings particularly regarding dreams and LDs can hinder you. So be possitive 
- You can do it, even if it takes time, you can do it.
I believe that would be the Reality Check hand technique. Where you look at your hand as a reality check as many people find that their hands are “different” in dreams, maybe an extra digit etc.
I’d go for reality checks, autosuggestion/MILD and WBTB a bit.
