For the first 2 weeks, I would bf 24-7 hon. You want to establish a really good milk supply for the future. That night time nursing is what will do that the best. Your body produces the most prolactin between (I think) 1am-4am.
After your supply is well established, it would be ok to give a bottle at the same time every day. You may be able to work out a time to pump and give ebf so you don't have to buy formula.
** With such a big baby, you may find that she falls into a sleeping pattern sooner. She also may not need to eat as often as the wee tiny ones. Aim for every 2-2.5 hrs for the first couple weeks, during the day. After that at least every 3 hrs during the day.