I bought a Marantz at Goodwill and now I have a few questions


Got a SR-18U Amp at Goodwill this afternoon. I know this is a highly outdated HT Amp but better than the Onkyo I have now (I think). I am looking for help on the best way to wire this behemoth. My main question is the best way to set up my turn table. I listen to vinyl 75% of the time. My Onkyo has a dedicated Phono port with a ground screw. How should I try this with the Marantz? I have a CD player which is easy but I also have bi wired Sonus Faber speakers and a powered subwoofer to move over as well. All opinions (including throw it out) are appreciated. Just thinking those 140Wpc could really make my room. 
telemarcer
So. I paid $50. Should I wire via TV/ect crap outputs for phono and ground with the 10+ ground screws that seem to be available? And then biwire my speakers without bananas and then do my sub via a different output? Sorry but new to this. Honestly Im glad to get a reply. I really appreciare it.
Use the "tape out" on your Onkyo into an aux input on the Marantz for phono use.
ok thanks. Ugh, so I would need both in my rack to make this work? I assume a basic phono pre Amp would be better and smaller?