I am new to thinkorswim. I would like to write a script to scan stocks. Here is what I want.

1. At the monthly chart, find the stocks the most recent 2 month volumes (2 bars) are greater than the average volumes (20 bars).
2. The prices of the two month are greater than previous month.
3. Minimum volume is 250,000.

I read the thinkscript manual. But, have no idea how to proceed. Can someone help?

def av = average(volume,20);
plot cond = (volume > av and volume[1] > av) && close[1] > close [2] and close > close[1];

also add additional fundamental filter for volume and set it's minimut to 2500000