I use Trello for my projects and planning. Trello is a great place to keep track of all the client projects for your creative business. You can keep all the contact info, project info, and links to invoices, contracts, etc. You can also create a board to keep track of leads and projects you are working on, to make sure you are not overbooking yourself.
I will show you how Trello work and help you to set up this tool for your business.