Hair below the ears doesn't get dirty much, the solution 'run off' does a good job of cleaning what little you need to on the length of your hair, but you can just squirt the solution all over your scalp and on your hair and using your fingers, just finger comb it down and wash like you would usually. The scalp, temples, sideburns, crown of head, and back/nape of the neck (basically your entire scalp) needs good finger scrubbing. Rinse thoroughly.
As for ratio, you can try 1/2 baking soda to 1/2 honey (or a little bit less if you think your hair tends to get greasy). Most people use 1 tablespoon of baking soda or less. I've been no pooing for a few years and now that it's winter, I don't use much baking soda, probably 1 teaspoon or less and my hair is shoulder length.
Mix everything in an old shampoo bottle or squirt bottle (not spray kind, but those in and out spouts). You can pretty much shake up the mixture and pour it little by little over your scalp. After you're done washing, rinse well.
People use a variety of things to restore the pH of their hair. If you can't stand the smell of ACV, you can use balsamic vinegar or fruit vinegars that smell yummy. I knew a few brunettes here who loved balsamic vinegar and a few redheads that used red wine vinegar. You can also try black tea if you're brunette, chamomile if you're blonde. I personally think black tea is pretty darn astringent and can dry your hair - but I haven't used it, so I'm not sure.
You can also use lemon or lime juice if you have light colored hair. For me, I have darker hair and lemon juice makes it look brassy and ugly rather than pretty and copper colored as with ACV (people think I go get it professionally highlighted with lovely copper strands, it's so funny), so I don't use lemon juice.
For whatever you use, use a squirt bottle with a spray nozzle, and apply the mixture from ears down (don't put on scalp area, your hair will look greasy). Rinse off before getting out of the shower.
See what works and adjust the amounts to what suits your hair. When you get more advanced, you can add essential oils to your no poo mixture to help with the scent and any scalp issues you have (or to moisturize your hair).