Polk users - Is this a good match and some newbie questions

[Blu Ray]

I am pretty new to home theater and am using a Pioneer VSX-823 Receiver, Polk Audio PSW110 Sub, TSx150c Center, and just ordered RTI A1 for my L&R.

First really newbie question - since my sub has input/output for L&R speakers am I supposed to plug those into the sub, then to my receiver, or do I just directly go through the receiver?

Second - will these speakers "match" well together? I read about how you want them in the same family of speakers, but I am not sure exactly if they are.

Lastly, any tips on my eventual floorstanding speakers? I am going to eventually move the bookshelves to the back, and use the floorstanding as my front LR.

I am in a house with a fairly closed living room, carpet, and have room for the speakers.