Welcome!
Yes, you can burn bootloaders onto them.
You will need a solderless breadboard, 16 MHz xtal, two 22pF caps, 10K resistor, a 100nF cap, and some jumper wires.
Read this thread regarding burning of bootloaders
You will download the sketch from the thread above and run that to download a bootloader into a blank part.
also i have upload the bootloader with codevison chipblaster programer by open the hex file D:\arduino-0022\hardware\arduino\bootloaders\atmega8\ATmegaBOOT.hex
and set manual the fuses to bootrst=0 bootsz1=0 bodlevel1=0
and this works well but i dont know if is the correct way!!!
one more question exept mega8 i have mega88pa, mega32, mega16, and mega8535,
in this chips can i upload the boot loader?? if yes what file and fuses can i use??