I was looking for the parts I need on some web sites and got confused. There seems to be a lot of info I need.

Will any 9 speed chain work for my 9 speed bike? is there other specs that I need to know?

As far as cables go. How do the ends get put on at the shifter side of the cable? Am I better off buying housings and cables and ends separately or am I better off getting a kit?

If I do buy separately, what are all the parts That I will need to get a full cable replacement done.

thanks

It sounds like you want to do it on the cheap, you can get the chain at the LBS, and check to see if the kit is cheaper than buying piece by piece (4 cables 4 housing). I don't use the little caps, just a little super glue ;]

I think I am going to stick with the housings I have, no real reason to replace them. All I realy need are the cables.

Any 9 speed chain will work with any 9 speed drivetrain.

If you're referring to the cable ends that are put on near the derailler and brake calipers (to cap the pointy ends), then you simply pinch them on with a cable tool or pliers.

If you're referring to the cable nuts that go INSIDE the brifters, those do not get "put on" by the end user, they come factory.

You're always better buying the cable and the housing by the piece/foot respectively, from the shop for cheapness. Kits are typically more (in my experiences).

Make sure you're aware that there are different cables AND housings for brakes/shifters.

Depends on why you're replacing the cable.
If they're damaged, pulling it out could scratch the inside of the housing.

Also if there's lot of cable friction, it could be that the housing is gunky.

Replacing the cables and housing together is a cheap investment in a well-running bike. SRAM makes quality replacement chains at different price-points specific to your drive-train.

The bicycle mechanics forum is a great place for questions like this: https://www.bikeforums.net/bicycle-mechanics/