This list is every possible outcome to your situation.

Hero bluffs OTT, Villain folds:
Hero bluffs OTT, Villain calls, Hero misses draw / Hero loses:
Hero bluffs OTT, Villain calls, Hero hits draw / shoves, Villain folds:
Hero bluffs OTT, Villain calls, Hero hits draw / shoves, Villain calls, Hero wins:

1) Write down the value of each outcome.
2) Write down the % chance associated with each step in each outcome.
3) Multiply the value by any percentages in each outcome
4) Add up all the outcomes (noting that some of them are negative). This is the total EV of your line.
5) IF there is a variable in your equation (I.e. Villain's fold rate OTT), then set the EV >= 0 and solve for the variable.