Not-So-Obvious Teaching Assistant Advice
There is so much good advice on this thread. If you do not have a clear purpose or endpoint of your destination than every road sign is irrelevant. There has to be a practical use that informs information. Information does not inform itself. We do it. So here is some advice that might help you find which advice is best for you.
For whom it my be worth, here is some advice that I've culled over the years as a graduate teaching assistant in the humanites.
1. top of the list. Have some clear vision of what kind of graduate teaching assistant you want to be. Do you want to be liked by your students? Do you want to be engaging? Do you want to enlighten students? Do you want to be seen as authoritative? Do you want to just survive through as you focus more on reserach? If you are fortunate to have had amazing teachers as role models, what qualities do you want to incorporate into the vision you have of yourself as a teacher? Do you want to be loose and free, or does being more reserved work better for you? Do you want to have empathy for where students are in their intellectual journey or do you want to be able to teach to all students?
2. Have a clear vision of the kind of classroom environment you want to create (depends on subject area, sometimes). Do you want more structure and "professional" enviroment? Or do you prefer something more informal? What works best for your content area? Do you want an active class, asking questions, engaged and speaking, or a class that is more focused and recpetive (not necessarily a bad thing for certain topic areas).
3. Have some clear vision of your ideal student. Are they enaged? Do they laugh at your jokes? Are they comfortable sharing in class? Can they ask questions without fear of judgment? Does the ideal student respect others opinions in class?
4. Take action to make these visions a reality by working backwards from the vision: "If I want a more engaging classroom, what actions can I take to contribute to this?" "If I want to be respected by students, what actions can I take to make this a reality?" How should I relate to students if I want to contribute to creating an ideal student? etc...
Keeping in mind that you cannot ultimately control how students respond to you, if they like you, respect you, etc...but you can nonetheless be comitted and focused on achiveing your vision of becoming the teacher you want to be (if you have a clear idea if what that looks like for you).