Keep in mind the reason you got married, nurture each other, and continue to grow. Everything being equal, it is best to move into a neutral house. Develop your own family traditions and rituals. Sharing common experiences tend to bring people together. Traditions and rituals are what many memories and future anticipations are made of.
Children have two parents and probably enough siblings.
They usually don't want more imposed upon them. The blending process takes 3 - 5 years. As a step-parent you should interact with your step children like you would if they were the children of a very precious friend and you were in charge to take care of them. Remember, the parent bond predates the couple bond. Acknowledge it, accept it, and appreciate it.