Commercialize a blog

I want find a contract based on long-term. The job is to change a blog into a membership based site. The website should have: Automate marketing Membership based content Sell on-line I currently use wordpress, opt-out email to collect emails, and use mailchimp to do marketing. I know I can use infusion+customer hug to finish this job, but it's too expensive. ****_> Please post your solution, the cost for the soft ware, and your fee below.