Welcome @Bigevil - its a lifelong sport so you have a lot of riding and enjoyment coming to you.
Living in SoCal - you not only have great weather year round but you also have good terrain to climb. Unless you live in a super urban area with tons of cars you can ride outside almost exclusively.
Training 3x’s a week is OK but I’d encourage you to carve out at least 4 improve at a rate you’d like and then up to 5 if you can.
Start with our sweet spot part 1 the basic version and if you can make all the workouts turn green move onto sweet spot part 2 and consider switching from the basic to the intermediate level.
Hope that helps and have fun out there!
If you have a powermeter or plan to get one the 5 steps in this training tip will help you get started!