Master Plumber. "Bathroom Group" search on this keyword. If you know the difference between all the various fittings, redraw with the right fittings. Then, depending on physical constraints that can only be seen first-hand, a Master Plumber will know what to do. 1. How to vent and 2. how to connect the bathroom to the stack and 3. how to connect the other two drains too. It takes years of training and experience. Too much to direct you over the internet, and I am not a plumber. Hope this helps. Hope the next input is from a Master Plumber who can tell you precisely what you need to know in detail at the right level of terminology so that you can implement exactly right what is required. I wouldn't expect it.