Welcome. In general, you should determine if you have a specific target event or season. If so, that event type and deadline will dictate your plan. You pick the Base, Build and Specialty to suit that goal, and set it backwards with the end day to the current day.
If you are just doing general fitness with no timeline, I’d suggest Sweet Spot Base (Low or Mid Volume) and then a Build that looks fun.
You can get some discipline specific guidelines on this help page: