APC does a reasonable job at keeking the information up do date, but there are a lot of inaccuracies right now.
Best place to get the latest numbers is
here
I can tell you my base pay is significantly more than the 10 year captain amount shown on the scale. The base pay changes almost every year. The whole scale goes up for inflation and you move up one step so it averages around a 6% raise. Some years it's been 15%. Base pay for F.O. when I started was only $4500/month. Now a first year F.O. can reasonably expect to make close to $100,000.
Upgrade is by seniority as long as you meet the minimum requirements for hours.
Monthly schedule is a rotating bid. It goes in five month cycles. You get placed in one bid group and that group rotates from bottom to top. Effectively you get two top bids/year, two second to top, etc. It works out pretty well and is one of the fairest I've ever seen.
Typhoonpilot