I'm expert in understanding how to build and monetize audiences through newsletters, podcasting and community. Built and sold the sales funnel review website funnelengine.com. Built and sold the Flipping Websites brand to Alpha Investors https://alphainvestors.com/press/ai-acquires-flippingwebsites/ Built and sold the Website Investing publication to Travis Jamison (Smash.vc) https://www.indiehackers.com/post/how-i-built-a-5k-mrr-newsletter-within-10-months-and-why-i-sold-it-71504ee036. Together we founded investing.io - a community for entrepreneurial investors.
I don't think you need a CRM immediately, but you do need to implement a drip email sequence that educates, nurtures and qualifies leads based on behaviour. I'd recommend taking a look at Drip - I wrote a post on why I moved to them from Mailchimp http://www.richardpatey.com/email-marketing-automation-leaving-mailchimp-drip/