Rizzi

I just bought a 1993 SUBARU IMPREZA L , I am not sure if I should change the timing belt. How would I know if this needs to be replaced. If it breaks I am too poor to get the mess fixed. Can someone help me find the link on ebay where I can buy the cheap but good timing belt in case I need to replace it? What is the difference in belt only and belt kit? Do i need kit or belt only? Thanks for help.