Questions on next steps with my power amp


Hi there, my first time buying new stereo equipment in a while. I bought myself a Outlaw 5.1 channel power amp. I have an old Onkyo integrated amp that does not have outputs to a power amp. So my question if I want to run a turntable, CD player, tape deck and a direct line from a computer to my power amp do I need a pre-amp, DAC or processor or a combination of those components?

I'm looking to spend around $1000 or below but will spend more if need be. Any suggestions on brand/models would be greatly appreciated. Thank you all for any help and advice
sftitan
Millercarbon, I just read your post. I need to process it and then read it again, but I think I hear what you're saying. I need to think through even the less sexy components like cables and speaker wire. I didn't know the power cable was that important. I need to read more about it. I appreciate you sharing your knowledge and I will let you know what I do. 
Millercarbon has provided you with much good advice. I have a couple questions:

Have you put the system together as is? The TT, Onkyo, and Klipsch speakers. How does it sound?

Are the speakers ones you want to build a system around? 
Mesch I got the Klipsch for free from a friend. I’ve read they sound very nice. Playing the receiver only with the speakers and TT sounded ok. Nothing amazing nor bad. The turntable isn’t very good so I’m really open to building a whole new system from scratch.

I used to be into stereos as a teenager and early 20s. Obviously couldn’t afford a lot but I read a lot and knew all the brands. Had friends with nice systems so I car in contact with high fidelity. I knew all about wiring. Obviously things have changed but the basics stay the same. Always thought with a power amp you get a preamp and tuner, CD, tape, etc. What I don’t know a lot about is DACs and sound processors.