It's a very vague question. There will be many different value resistors and capacitors on your circuit board. It's a little like asking "What part do I need to fix my car?"
If you have a fuse that has blown, then that fuse has done it's job in disconnecting the voltage before more serious damage can be done. So before you replace the fuse you must find what caused the fuse to blow. Similarly, if a resistor has burnt out then that would normally indicate that a component has allowed too much current to flow through the resistor.
In short, we will need a lot more information before anyone can attempt an answer.