You can download the Auto Hot key (AHK) from here : http://ahkscript.org/ . There is also another AHK program called "SAMP key binder" but i think this would be more easy to use .
Here are some steps in which you can create a bind of your own :
1) Download and install the AHK program from the link given above.
2) Now after installing the program you can create AHK script ( just right click anywhere in the background >> click new >> click AHK script)
3)then right click on the the script and click edit script , now you will see a window pop where you can start typing!
4) You can clear the default screen and start making your own bind .
5) After creating the bind you need to save it .
6) After saving make sure you double click on the script to open it. Now you will see the AHK script symbol in your taskbar.
And now you are ready to use your binds .
Here are two of the binds that i use :
http: //pastebin.com/tG3MbwuB http://pastebin.com/m2V3mLEt (my sprint bind)
1. Head here > http://www.gtagarage.com/mods/show.php?id=21662
2. Download Mod
3. Open it when downloaded.
4. Assign soms text in the bar and assign it to a hotkey.
5. Press the nuke and press the hotkey, then you will have your hotkeybinder.