hifi engine

Behind the times

I have an old Luxman integrated amp that I love but want to expand upon. I haven’t upgraded any of my equipment since the late eighties. I have a single Luxman LV-103 feeding tow B&W Matrix speakers. I want more power (doesn't everyone), I want to add a sub-woofer and two higher frequency tweeters to my system. Amp possibly a set of rear speakers (room is prewired for them). I just purchased (on e-bay) an LV-117 integrated amp.
Can anyone help me figure out how to configure a new system? I thought buying a TP-117 might be the way to go or a surround sound signal processor.
Music systems have come a long way since I last spent money on one, any help will be appreciated.