Which topic should I study first?(Chemistry Subject)?

You might want to look at the table of contents for chemistry textbooks via a Google search.

For learning, you should search for some web sites to help you. Here is mine:

http://www.chemteam.info/ChemTeamIndex.html

You should also look for videos of people solving various type of chemistry problems. I recommend you look for Kahn Academy.

Yahoo Answers Chemistry seems to be quite active compared to other chemistry forums. Post your tough questions here and you stand a good chance of getting some answers.

Best wishes in your study of chemistry.

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http://www.biology.arizona.edu/biochemistry/tutorials/chemistry/main.html