Schedule a demo to learn from Ontraport directly.
Way less expensive than all the time and money you'd invest in doing all this from separate platforms! This even includes landing pages and websites! Just the landing pages themselves are worth it. Includes SSL security.
Are you looking for an online store? Shopify is one of many good options!
You can hire someone who's worked in the Shopify or other e-commerce sites for something that is easier to manage than a custom site! (of course, you have many customization options available)