The first piece that is key is to have a calendar where you can record all of your information in. I prefer Google Calendar because it talks nicely with all of your devices and can be accessed anywhere/anytime.
The second tool you need is a task manager to help you keep track of your tasks. Google Calendar conveniently has a task manager built in.
The third tool that is important is some way to manage your tasks on your mobile device. I use an app that works on android and apple products called Gotasks.