What industry do you mainly serve?
How much website traffic do you receive per month?
How big is your current email list?
How much could you afford to spend in advertising?
What type of product do you sell?
Do you know how much sales you make per lead or your earnings per click?
Do you send emails to your list?
What's your experience with Facebook ads?
Do you have the ability to split test your sales page?
What type of impact would growing your email list by 2-20k emails/month have?
Do you have any upsells for your product?
How important is it to you that you grow your email list?