At the risk of sounding like Captain Obvious, the first thing to do is to see where you can reduce your energy usage without impacting your lifestyle. 66KWh is a lot of energy so if you can do things like install more insulation, get more efficient Air Conditioners, water heaters, etc it will make going 100% solar a bit easier and cheaper.
If you want to build in stages, it is important to have a 'final' design from the beginning so you are not buying stuff now that you will have to replace later.
Lets try and get a rough idea of the size of the system.
Solar Panels:
Right now the sweet spot in solar panels is the newer 450ish watt panels. Since you are in Arizona, I will assume you have a favorable insolation number of 5. With those assumptions, you will need (66000Wh/5 hours)/450W/panel = 30 panels to produce the daily 66KWh That is a fair number of panels but not an unreasonable number.
Most good MPPTs have a working voltage up to around 500V, but you need to leave some room for cold temperature voltage rise. Lets call it 450V. These newer 450W panels tend to have a high Voc of around 50V So you can have around 9 panels per string. With that in mind, let's assume two strings of 8 and two strings of 7 panels. You will probably need 4 MPPTs for that.... we would have to drill down on the numbers to see if some of the strings can be paralleled on a single MPPT. If you want to do more you could add a panel to each string.
The usage description does not include peak power, but I would guess it will be reasonably high in the summer. Let's assume at least 20KW.
That is most likely going to require a couple of inverters.
Battery storage should be at least 1 full day of power consumption.... 66KWh. Most residential large battery systems are in the 13-14KWh range, so you will need 5 or 6 of them.
Now let's spec out a system. I know the most about EG4 gear, but you could do this with many different brands
Solar Panels: The Blue Sun 460W from Signature Solar are a good buy. They are bi-facial so if you can ground mount them in a way that gets sun to the back you will get an extra boost above 460W.
Inverters: Two EG4 16Kpvs would probably do well. You would have 6 MPPTs and 24KW continuous capacity (And a surge capacity even higher).
Batteries: The EG4 Power Pro batteries are 14ish KWh so 5 of them would give 70KWh. Since you have a container to put them in, you can save a few dollars with the new Indoor model they just released.
Now we need to talk about how to phase things.
Solar panels: Buy a full string of panels at a time. Panels get replaced by new versions in a very short time and it is never good to mix panel types on an MPPT. Consequently, don't expect to add more panels to a string a few years down the line. You could start with a single string of 7, 8 or possibly 9 panels and add more strings as budget permits.
Inverters: This one is harder to predict. Inverter models tend to stay around longer but if you buy one now and can't buy a second one later it could be a problem. (Different models of inverters can not typically be run in parallel) I would tend to buy both inverters from the beginning, but I understand that can be a pain in the wallet.
Batteries: Ideally, all the batteries would be of the same model, but it is possible to parallel LiFePO4 batteries of different models as long as they have the same nominal voltage. Consequently, you can usually add battery capacity over time. The potential issue is that you might not be able to run all of them closed-loop with the inverter. (EG4 has their Coms Hub that lets you do some mix-n-match between older and newer battery models and still do closed-loop. I assume they will continue that pattern and support old versions along with newer versions)
Planning: (This is important) Figure out where everything will go and how it will be wired before you install anything. It is a real PITA if you have to move a component, run a larger conduit or even re-trench to your solar array when you expand. Planning ahead makes you far less likely to have to re-do the previous work.
