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I am very Interested for doing chemistry job related subjects. I am a very hard working, and self-motivating person. I wish my work experience hopefully makes me an appropriate candidate for you job position. In addition, I have started to learn Polish from November 2012. I assure you that I will try my best to be able to understand and speak Polish as quickly as possible. In addition, I was granted visa and authorized to live and work in Poland from 23rd October 2012 for 2 years.

Furthermore, I do not mind to work in restaurant or hotel like doing cleaning, washing, cooking and serving the foods. Since I do not know Polish very well I need some time to communicate and speak with people. I believe working in restaurant and hotel could help me to improve my language besides helping with cleaning and cooking.
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Are these sentences written correctly?

I am very Interested in doing jobs related to chemistry..
I am a very hard working, (no comma) and self-motivating person.
I wish my work experience hopefully makes me an appropriate candidate for your job position. This is correct grammar, but you are saying that your work experience does not really suit the position, only that you wish it did. Is that what you intend?
In addition, I have started to learn Polish in from November 2012.
I assure you that I will try my best to be able to understand and speak Polish as quickly as possible.

Moreover, I was granted a visa and authorized to live and work in Poland from 23rd October 2012 for 2 years starting 23rd October 2012. This means you are permitted to work in Poland from 23 October 2012 to 23 October 2014. Is that what you intend?

Furthermore, I do not mind to working in a restaurant or hotel like doing cleaning, washing, cooking and serving the foods.

Since I do not know Polish very well I need some time to communicate and speak with people.
I believe that working in a restaurant and hotel could help me to improve my language besides helping with the cleaning and cooking.
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I really appreciate your help dear Alphecca. About your first question I did not mean to say my work experience does not suit the position on the contrary I wanted to say it completely suits. Could you please help me that how to formulate this sentence to say that I believe that I am the right person for this position?

About your second question I meant what exactly you explained.
Here is what you need:

I know that my work experience makes me a good candidate for this position.

or

You will find that my work experience makes me a good candidate for this position.