Little help from the expert please....

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I'm a beginner of these electronic component things, so I need a little help from the expert, maybe this is not the correct room for posting this, but I still need some expert minded to help me.
Please help me to design an easy diagram of remote control car's electronic speed control. This ESC thing is looks like the picture that I attached. This ESC is use to amplfy a week signal into a stronger one which is similar to audio amplifier. I've choose HEXFET for the ESC which is IRF1404 and IRFz40. I only need one signal to be amplifed (I think this diagram would be easy for the expert). Hope all the expert here can spend a little time to help me. Thanks.
 

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Maybe my question is a little bit "blur". Or anyone here know any part that is light weight but powerful that can handle up to 20Amp or more? just like relay. someone told me that there is a part name spst switches, actually I don't know what is it, can anyone explain it to me or show me any website.
1, powerful switch that can switch fast and can be function in low current and amp.
2, Anything that can use one R/C car to replace electronic speed control.
 
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