Take a look at my article on the Surplus Calc, which also includes links to a podcast and Youtube tutorial at the bottom: http://www.fangraphs.com/fantasy/ottoneu-surplus-calculator/
To address your specific questions:
1) Proj. Team Value is calculated by taking the actual Keeper Value and adding in the projected Value that can be bought at the auction. That amount is the remaining salary ($400-Keeper Salary) times the Discount %, which represents the fact that with inflation every $1 spent at auction will buy less than $1 in value in aggregate. The Discount % is just the inflation % expressed as the % of value that can be bought for $1 in salary (inflation % is the % of salary that must be spent above $1 on $1 of value).
2) Total Salary (expected) is a fixed number and represents the total amount of $ expected to be spent by all teams. In this case that number is $4,620, or $385 per team. With the possible exception of first year auctions, there is typically about $150-$200 not spent in total by teams at the auction. Total Value should be the same as Total Salary (it looks like it isn't on this Alpha version of the calc, I'll tweak that the next time I update), and represents the total $ value of all players on the preloaded $ values. So basically, I always scale my $ values to match the total amount of $ I expect to be spent.