Hi Everyone!

I'm about to attempt a cable & housing replacement for my road bike and have done a few hours of research on the best way to do it. Most suggestions recommend using a tube that you can slide over your current cable and use as a guide to slip the replacement cable through, but none of them state where I can buy one of these tubes or even which type of tube will work.

Is there a type of tube you'd recommend, hopefully something I can pick up online?
Should I stick with SRAM cabling and outers or test something fancier like Jagwire?
Am I better off buying a bunch of single cables and outers and cutting them all to size, or picking up a pre-packaged "cable set"?
Do I lube the cable before inserting? Some say yes, but most say no - I ride in the SF Bay Area so very dry most of the year.

Thanks for your help - any additional tips or recommendations are greatly appreciated!

Cheers,
Matt