I haven't started composting yet, should I do earthworm composting, or hot-cold compost? How do I start anyway, what type of worms, and proper carbon-nitrogen ratios? Any good recipes?
Composting is easy. But as far as recipes there really aren't. Composting can be more of an art then a science. So much depends on what you put into it. There really is no wrong way. But if you encounter any problems they can be corrected depending on what you have going on.
Simple Cold Composting:
Simple composts are done by selecting a spot and tossing scraps, hay, grass clippings, etc. and just allow it to break down slowly over time. A box can be built around it with an opening at the bottom to scoop out the finished product at the bottom while continuing to fill it at the top. No fuss no muss. Worms will come in from the bottom to do what they do and you may even find some black soldier fly larva now and then. You do want to refrain from adding meat scraps as that may attract fly's and fly maggots (just a word of caution).
Hot Composting:
Hot composting does break down the material much faster but is a little more work. You will want to layer nitrogen producing materials ("green" - grass clippings and/or garden waste) with dry ("brown" - straw and/or leaves). Layer like a lasagna 3-4 inches green, 3-4 inches brown, wet down with hose (wet but not soggy), repeat until you have filled your pile. You can still add to the pile anytime. The pile will get quite hot and if you lift up part of it in a day or two you will see ash forming - this is good. If the pile has cooled down after a few/several days you can take a pitchfork and either stir the pile or starting from the top down turn the pile over in a spot right next to the original pile, which will give it a good stirring and you a workout. If you need to you can give it a little water as you're turning as at this point you still want it damp but not soggy.
If a hot composing pile will not heat up then you need to add more green (or possibly water). If it starts to smell sour then you need to add more brown. Two easy solutions.
Worm Composting:
You use worms called red wigglers and are not the same as earthworms. You can purchase them to get you started. They are kept in a bin or box outside. I started mine inside in a large tub until I got too many (they bred and multiplied quickly at optimum temps and food supply) and now keep them outside. When Shredded newspapers are used as bedding and food scraps buried under a layer of the paper you should have no odors. The need to be kept damp but not wet, soggy, or flooded. The do great work and their castings make excellent fertilizer for your plants and garden. I use it to jump start seedlings for garden planting. I have had lots of new potatoes started just from tossing in the peelings.
Black Soldier Fly composting:
I have no information to offer here. I intend to start one next year so I can use the larva to feed my birds.
Composting is great and highly encourage you to try one of the above suggestions. There are as many suggestions on ratio's as there are compost piles there is really no right or wrong way. If problems arise then there are easy solutions to get them back on track without starting over.