Homebrew PCBs

Hello
 
I am building a DC PWM board.
 
I am designing my own board on diptrace that I intend to etch myself. and would like to use surface mount components.
 
I need to use an 8 ampsurface mount diode ( http://www.electro-tech-online.com/c...6b80af50a6.pdf) 


I understand that i will need to use a heatsink but i do not now how to do this with surface mount devices.
 
Can any one explain how this is done? 

Thanks.
 Charlie