Vol Surface Trading questions?

I want to trade Vol on the SPX Index.  I have done so in the past on a different stock index simply using the market skew to update the vol during the day, back & front end months delta neutral and a healthy short gamma (when necessary).

1. Where can i get (or buy) excel that will show me the vol skew/ open positions/Changes in open postions --all plotted on user-friendly graph ?

2. Under the following scenarios
A - market moderate higher
B_market moderate lower
C- market much higher
D-market much lower

Assuming a normal skew for an index option (straight line down) -- how would my skew look like if it changed from normal to A,B,C and D - and how would you take advantage of the move.

thx