Very good!
-This is kind of a dumb complaint of mine, but Artem would be said (by an American) "Артэм". I don't know Russians names too well, so if your name is Артём, just know people will likely say it completely wrong.
-I'm American, we spell words like "memorise", or "practise" different than the British/Australians, I'd spell it "practice", and "memorize.
-You can say: I am learning the English language, or just: I'm learning English.
-With languages, we say "in _____". So "in Russian", or "in English".
-"At present time" is wonderfully fine, but sounds more intellectual than standard speech. When speaking with a friend at a cafe or something - Strange. When speaking in a job interview - entirely necessary.
-Took me a bit to realize, Hi all is how it sounds when said aloud, but written it's sort of wrong, it would be "Hi y'all". Outside of the southern U.S., we'd just say something like "Hi everyone".
-"I learn the English Language", I learned, or I am learning.
-little is an adjective, so "little of" should just be "little free time".
-Plural nouns can never come after a/an. In this case you can just say "Before now, I read simple texts and watched tv shows". The vocabulary here is different than in Russian, you guys say serials, but in English this is not understandable if one doesn't have experience with Russian, we call them "TV shows", TV series, Sitcoms, or just by specific names. I assume you used the word "adaptive" based on the definition google gives you, "Characterized by or given to adaptation.", which *I* don't even understand, that's not what that means. Google!!. Adaptive means something changes based on its environment...
-I completely understand your trouble with the word "do", it's very strange and practically unique to English. (Can somebody give me advice about an interesting TV series, good for learning English?) If it's not on TV, you'd just say "interesting series"
-We'd say "Probably enough practice for today.". We use infinitives differently, we use noun forms of verbs in many cases like this. In this case, the word is just practice. In others, we use the -ing form of the verb. To run---Noun form---> Running

As for a good TV series, there are surely plenty. Some general favorites (of basically everyone who has watched them) are: How I Met Your Mother, Friends, or Seinfeld. ))