As everyone has said, breaking it up by where it is in the process will help you not get overwhelmed.
Many college will have pre-made guidelines which include such timelines. I would definitely ask your theatre if they already have one, and then you can use it as a base.
The most important thing is that your To-Do list will change depending on where you work, so whenever changing venues I would be sure to double check your responsibilities.
One of the things that has helped me be successful in terms of to-do lists is ALWAYS thinking of the others involved. You may not know everyones deadlines but thinking logically will help everything run smoothly. For example, if you need to make photocopies of the script - do you have to also provide them for designers? If so, they probably want them before the first rehearsal.
This also can relate to the smaller, pre-show to-do lists ie. when you arrive at the theatre. I am CONSTANTLY planning everything backwards. For example, if actors are called at 6pm then everything should be ready for them at 6 pm. That means I arrive at 5pm in order to do a,b,and c. But I know that I can do d, e, and f while the actors are dressing.
My general rule of thumb is the sooner the better - use your To-Do list, but trust your gut and instinct. Think something should be done now, just do it - even if your to-do list says it doesn't have to be done till next week.
