Subwoofer help

[KD00LS]

I just bought two rockford fosgate 10 inch subs, a rockford fostgate 900 watt amp to power them, the box, and the wiring. All for 100 bucks, its good to have friends :Beer . The problem is I don't have rear deck speakers like people have mentioned before, so can I still have something installed to control the bass from the stock head unit. I think I just have rear door speakers. Any suggestions, preferably llegible so I can print them out. Thanks I appreciate any help.