Start making a checklist of things that you have in your current home and will need and want in your new home. I see that you already started that in terms of the structure of the home, but consider also “contents” and “services”.
For one thing, of course, you’ll need “mail service” – duh. But consider that some mailers need more notice time than others. For example, magazine publishers usually want at least two months’ notice of your new address to avoid having issues sent to the old address and discarded rather than forwarded. (Only first class postage is forwarded “for free”.)
If you have plants or pets in the current place, consider how you manage the move to keep them alive and healthy. Depending on where you move from and how you manage that, there may even be quarantine issues.
Landline telephone service may not be a major consideration any more, but if you do plan to have a wired telephone at the new place, consider how long it will take to have that installed, and plan accordingly. Ditto cable TV, electric power (which we could assume that a current dwelling already has hooked up, but you need to get the service in your name). You also need to have those services turned off in your current home as or after you leave. (You definitely wouldn’t want to leave an existing cable TV and telephone hookup ‘live’, because of the possibility that someone could watch a lot of pay-per-view which would be added to your bill, and tough to fight.)
When you make the move, you’ll also want to consider the day-to-day items that you need to have available the first day, night, week at the new home. You don’t want to have to search through a lot of potentially unmarked moving boxes for one or two ‘must have’ items that you could easily have packed in a single box or suitcase and either carried with you to the new place or made other arrangements to be sure that it is on top and available when you first arrive. (This is even more of a consideration, of course, if you may need to stay in a smaller than expected place when you first move, and keep many of your things in storage, either with the mover or in your own personal storage location.) If this is your first time moving to California, be ready to move into significantly smaller spaces; real estate is still very dear in most parts of that state, compared to elsewhere in the country.
If you have prescription drugs, then keep them handy, as noted above. In line with that, you’ll want to have a relationship with a doctor and dentist and any other special needs services at the new location. You can’t start looking for those too early, either.
Checklists. Make checklists.
So far in my life I’ve made 6 coast-to-coast whole-house moves within the US, and many more that weren’t quite that dramatic. It’s never “routine”, and without a lot of planning and the afore-mentioned checklists (I did mention them, didn’t I?) you will forget a lot of things and lose a lot of time – and money.