Do not worry. You will develop English and writing skills as you go along here at ISC. Use the forum as your base. Start interacting with members in the various threads. Read carefully how members respond, look up the dictionary for words whose meanings you did not understand, see how sentences are formed and spacing is done, where punctuation is placed, etc. Free online grammar tools are also available, but may not be 100% accurate.
For starters, avoid using short forms of words like 'u' instead of 'you'. This resource may also help you: Good article writing tips. You can also learn English from our Learn English section.
When people come at you with their worst, you should come at them with your best (advice given to Selena Gomez by her mother, quoted in Time magazine.)
Before posting in any section in this website, go through its guidelines. If you are unable to find any info, you can post a thread in Forum section to get it clarified. There are various sections in this site which can help you to share your knowledge and earn little money. Go through your posts twice before submitting to avoid any grammatical mistakes. As mentioned in the above response, start responding to forum threads to get more hands on and also to know updates from this site.
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease