How do I help my animals adjust to moving?

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? im going to baby gate the basement in the new place so the cats can get away from the dog and it has a decent side yard. the cats tolerate the dog most the time and run away if they get bothered which is why ill do the baby gate to give them a safe place. 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. thanks! :)