There are several free good engines. Here you have a list: http://www.computerchess.org.uk/ccrl/4040/
free chessengine
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Your english is fine. Stockfish has been the best for awhile now but even the old Houdini 1.5 will do the job. What are you planning to use the engine for? Much of your experience will depend on the GUI (Graphic User Interface) that you choose. Commercial engines like Fritz or HIARCS come with everything ready to go, but if you are going free you have to put it together yourself. Scid Vs. PC is a very popular free GUI with an active community of supporters. Feel free to do a "search forums" if this is all new to you. Lots of previous threads on this. Good luck!