Hi, my name is Mihailo. I live in Serbia. In my country it is very, very hard to work and earn enough money to support your family. My monthly income is around $200, and life expences much bigger than in USA. For example, one gallon of gassoline costs $6. Due to all that I was considerring an option of coming to USA to work in order to provide decent life to my family.I'm a very skillful worker,with any job, but especially with plaster-cardboards. So, I'm asking if there is anyone who could help me and tell me what is the best way of getting a working visa, and how to do so. If there is anyone who has experience with this, please help. Excuse me for my english, it's not very good. Thanks in advance.

The US is in a recession, and construction work isn't easy to find at all. I think you are referring to 'drywall' installation in buildings (also called Sheetrock, gypsum board, gyp board).
I don't know what the immigration laws are at the moment or the quotas, so perhaps others can help, but you will find that getting work here might be just as bad, and the cost of living still quite high. You may need someone here who can say you will be living with them at first too.
I was on wikipedia the other day reading about the tiny country of Andorra, where employment stays around 100% even now!
Good luck.

Thank you for answering to my question. If anyone else has something to tell me about this, please do so.

Unemployment rate is US is at the highest in 40 years, and Department of Labor and Immigration are now cutting number of employment visas issued to foreign workers in US. Sorry to say this but your area of expertise is not one of those "required" plus there is not as much construction work anyway.