From the start of your website you want to be collecting your visitors email addresses to stay in contact with them. Mailchimp is a marketing automation platform and an email marketing service that can do that.
Scrivener is a word-processing program with a management system for documents, notes and metadata. This allows the user to organize notes, concepts, research and whole documents for easy access and reference.
Trello is a web-based project management application which I use everyday as my to-do list. I like this app as it allows seperate boards on seperate sreens for different projects, so I can focus on one thing at once.
Siteground is one of the best and cheapest hosting platforms. With Siteground you get WordPress for free to install on your site. This is all you need to get your site up and running.