HBJ

I have a pair of KG4s that I bought in 86. I have decided to build a home theater system around them and would appreciate some advice on components to add. I am not an audiophile and have quite a bit of hearing loss in one ear, so value is more important than perfect sound. I have a Kenwood VR-505 receiver that I will use, but do not have a sub-woofer, center speaker, or surround speakers. What are some recommendations for these pieces? Also, assuming I would buy them one at a time, which should I look for first; center speaker, then sub-woofer, then surrounds? Or a different order? Thanks in advance.