Identify (or hire) a team member you can train who is as adept at training others as you are (or even moreso). Teach this person so that you can delegate much of the time-consuming one-on-one training to them (and so there are at least two people who know all the processes necessary to keep your start-up running).

Have this person document processes. One excellent inexpensive way to do that is using Screencast-o-matic http://www.screencast-o-matic.com/ to create short videos on how to do specific tasks.

I recommend using Trello http://trello.com as the fast, easy way to collaborate across a team. Create ongoing processes as lists on boards there and then move the tasks from list to list to show where each task is in your process. This is easier explained using screen sharing on Skype or by watching videos on how Trello works. It is extremely simple to set-up, use and learn.

By setting up Trello boards you can instantly see what team members are focusing on and what they've accomplished so far at a glance. You can set deadlines and import them into a calendar visible to all team members or just you. I highly recommend using Trello as the best collaborative solution available. You'll like the price: free until you need advanced options or want more granular control of who can do what.