TA for your first few semesters to have time to look around. Spend a lot of time talking to faculty that you might want to work with. See if they would be open to working on what you want to work on. Check if you can work with people outside of your department and consider that option as well. Go with your instincts about an advisor and whether they are a good match or not.
Some people schedule regular meetings with their advisors.
I had regular group meetings each week and then individual meetings were scheduled at my initiative. Make sure you are having meetings with your advisor. Twice a month is a good number to have. Every two weeks is a good time schedule for individual meetings. Yes - I was assured of funding for the whole program when I selected my advisor.