Need help choosing and customizing a CRM system and integrating with email marketing platform

We need help deciding on and selecting either a CRM system or database platform based on our company’s needs. We will also need help with integrating into an email marketing platform, such as Mailchimp. The key here is in understanding what it is we are looking to accomplish and helping us select the most simple, efficient and cost-effective solution for our needs. We will then need help setting up the platforms and doing any simple customizations. Our business needs to collect 3 different types of contacts: 1. Lenders 2. Companies 3. Investors We will utilize the CRM to collect different information on each and will use email marketing for the Companies and for the Investors, each with separate types of campaigns. Beyond standard contact information, we will need to create 6-7 custom fields for both Lenders and Investors and 1-2 custom fields for companies. We then want to ensure seamless integration with the email marketing platform to easily run campaigns.