First notebook entry: Introducing myself

I am living in Tokyo. I expect to practice my conversation English with an English native speaker.

Your sentences are grammatically correct although you can change them a bit to make them sound better. I suggest the following changes:

I lilve in Tokyo. I wish to practice my conversational English with an English native speaker.

First notebook entry: Introducing myself

Hello, ьy name is Elena. I am from a small town Orsk. It is located in the eastern part of Russia near the border of Kazakhstan. My native language is Russian. I have been studying English for a year. I would like to know it as good as possible, because my future job related to English.

Including the correction given below/above, one more correction is needed in the last sentence that is "my future job is relation to English"

First notebook entry: Introducing myself

I am Mary Shen from China. And I am learning English, because I want to make friends with you. My native language is Chinses, and I grew up in China. I enjoy roller-skating .

Your English is amazing. The only err I found above is the spelling of Chinses which should be 'Chinese'.

First notebook entry: Introducing myself

I want to learn english..........

kono sentence er sheshe . (full stop) lekha hoye kenoki ... lekhaar maane tumi ektu themey aagey aaro kichhu likhbe.

First notebook entry: Introducing myself

I m learning English.Because i want to study abroad and work in London..........

Firstly, I aar m er maajkhaane ' (apostrophe) lekha hoye bina kono space diye, for example I'm...apostrophe naa diley tahole I am lekho. Apostrophe kono duto shobdo ke ek shonge chhoto koraar jonne use kora hoye. 

Secondly, Because kokhono kono sentence ke shuru koraar jonno us kora hoye na ei jonne no full stop before because.

Thirdly, kono sentence er maajhkhaane nijer bishoye bolte gele capital letter I hi lekha hoye small letter i na.

Finally, sentence er sheshe . (full stop) lekha hoye kenoki ... lekhaar maane tumi ektu themey aagey aaro kichhu likhbe.

The sentence should be:

I'm (I am) learning English because I want to study abroad and work in London.