First thing that you need is a webpage - but not an ordinary one - you need a webpage that will evolve together with your business. Considering that every company is different the webpage can't be based on a template. You are not a professional copy-writer, graphic designer nor data architect so building a webpage for your company with a "simple" drag&drop tool isn't a solution too.
You have 3 seconds to impress the customers visiting your webpage. They can visit your webpage using their smaptphone, tablet or desktop computer. Your comapny webpage should look gorgeus on every device. If you convince them - they will want to get through your story. A good webpage is like a meeting with your sales representative - first impression matters. Then you should tell your story to keep up your potential customer interested.
If your story is convincing he will probably want to contact your company. They can call your phone number, send you and e-mail, use live-chat on your webpage on send you a message on social media. You need a tool that integrates all this communication channels with your customers in one place. You can't afford wasting any sales lead on any channel.