Is there a way to prepare/ help my animals with my upcoming move?

I have a 2 (in july) year old beagle and 2 3 (also in july) year old cats. they have lived where we currently are since the dog was around 7 months and the cats about 1 and 1/2. I moved home with my parents a little over a year ago and now im ready to move in with my boyfriend. We got a 2 bedroom place (bottom floor of a house) it has a full basement spacious rooms and a porch in the front. plus an extra room in back that's not heated in the winter but still use-able. so its a good size but my parents (where i am now) have a huge house. 5 bedrooms 3 bath 2 living rooms 2 basements... huge!!! how will my animals adjust to the move? is there anything i can do to make it better for them? im going to baby gate the basement in the new place so the cats can have their own space away from the dog and it has a decent side yard. the cats tolerate the dog most the time but what wil happen when they have a smaller living space they will have to share? is there anything i can do to make the change easier on them? the place doesn't open up for a little over a month yet so im not moving till then but i want to have everything figured out before hand. I also want to know any advice about helping my dog. shes still young so she has tons of energy. i just don't want them to be stressed out. plus the new place is across town, if any of them get loose are they going to go straight back to my parents house???