Use "much" to describe a relative amount of a noun that can't be easily counted or quantified. If you can't put a number before the noun, use "much."
Also, if you replace the object with a pronoun, it should be singular (it). Consider "collective nouns" that are singular but describe an unquantifiable volume.
"Much" is often combined with a modifier like "too," "not," or "very."
There is not much snow on the ski slopes this year. It's a small amount.
There's much work ahead before the end of the project. It's a big one!
There's too much sand on the beach to count it all. It's everywhere!
"Many" describes a quantifiable, countable noun. If you can put a number before the noun you should probably use "many." Here if you replace the object with a pronoun, it will be plural (them, they).
Many ski-lift operators will be looking for jobs. Who will employ 30 of them?
This project has many complex parts to consider. They are all critical - all 1000 parts.
There are too many grains of sand on the beach to count them all. At least a million of them are in my left shoe.
Using "a lot of" or "lots of" is sort of personal preference. In most cases the 2 are interchangeable.
There is a lot of ice on the road, so drive carefully! Also, there's lots of snow!
We still have a lot of work to do - lots of separate tasks to complete.
I found a lot of sand in my right shoe, and lots more in places I didn't know existed.
A lot of people make the mistake of writing "alot," so don't do that!
In most cases either one works fine, but you should be careful about replacing "a lot" or "lots" with "many" or "much." Note that in the examples below "many" works in place of "lots/a lot", but "much" doesn't work at all.
At first there was just one monkey, but then the banana truck exploded and there were lots of monkeys running all over the place!
A lot of the monkeys ran off to the beach afterward. Lots of bananas still litter the road though.
The town will need to hire a lot of people to clean them up. Lots of people need jobs now anyway.
Honestly, the difference between these phrases is not big enough to matter. I am having trouble thinking of a situation in which you would want to use one over the other.
If I heard any of those phrases, I would assume the speaker could ask basic questions ("How are you?"), but might have a little trouble using this website or understanding my answer here.
I am leaning towards agreeing with Phoenix, in that "some" is a slightly larger amount than "a little" or "a little bit".
However, people who are being modest may say they only speak "some English" or "a little bit of English", when they are actually quite fluent. On the flip side, I have a boastful peer who says he speaks Spanish "well", even though he only knows the very basics.
Judging by your other posts here, I would say you speak more than just "some" English. You could use any of those phrases interchangeably. The person you are speaking with would probably start out with low expectations, and may end up being pleasantly surprised that your English is better than they expected it to be.
Best Answer
As little as, as much as, as few as and as many as are idiomatic phrases.
The definitions in Merriam-Webster dictionary are:
But
As you can see, "as little as" is almost the same as "as few as", but the former can be used for a quantity while the latter can be used for an amount (see this question for the difference). These two are interchangeable in some cases. But all the examples you provided are related to continuous quantities, so "as few as" is not suitable. As a suitable example, you could say "In my math class there are as few as two girls".
However, "as much as" does not carry the same meaning - it is typically used in different contexts (which makes it much more common; see these Ngrams). Using "as much as" instead of "as many as" (as in your third example) may be considered correct, but it will likely create some confusion when the sentence is read, so I would suggest using "as many as" instead.