(1a) With that said, when the the client pushes back on using your MSA (2 out of 3 bigcos will), bite the bullet and use theirs, because you will rarely win that fight. You need a lawyer to review these.
(1b) You're not negotiating or reviewing contracts until you have the "verbal" commit that you won the gig. It's called a "verbal" because the "written" is the contract negotiation, which you wouldn't waste the money on unless you won the gig, so you need a verbal.
(2) Grab one off the Internet. Generally, for your benefit, the master will specify a term, a venue (disputes resolved in your state), compensation terms (net-30, etc) though note that the master will usually refer to a SOW for the actual price, and limits to your liability. For the benefit of the client, the contract will make it crystal clear that you are 1000% a contractor and not not not a full time employee I say it again not, assign all intellectual property generated during the engagement to the client, and possibly require you to maintain professional liability insurance.
(3) You write a proposal. The proposal usually has bios at the end of it. A bio is like a less formal version of a resume.
(4) Chicago, NYC, and San Francisco, plus all over the country.
(5) Wide mix 'o both.
(6) Something in the neighborhood of 40/60?