Your current usage is a starting point. Adjust for larger or smaller house, more or fewer electrical appliances, heating / cooling system, and insulation.
Starting with an eg4 18kpv or solark 15k inverter will give you expandability.
Install all the conduit you may ever need.
(Put panels on all roofs). Ground mount is even better if you have the land.
Start with one roof section. Fully panel the best roof for solar. Compare that to your estimate. Keep adding roof sections until you reach your estimate.
Once you are in the house, if you need more, then pick the next roof section. Of you have too much, you may grow into it.
For batteries, start with one eg4 powerpro (15 kwh). Make it easy to add more batteries.