Good advice so far! A couple of additional points:
Don’t just choose classes; choose instructors. There are some wonderful instructors at CC’s who will go above and beyond to mentor you if you show genuine interest in their class and subject area. There are also duds. This is true at top universities too, of course; but at cc you’ll be able to pick and choose if you register early, so take full advantage of that ability - register as early as possible and look up all the info you can on who the best instructors are. Prioritize this over choosing a class at the most convenient time, or taking your classes in the exact order you planned on. RateMyProfessors isn’t a perfect tool - you have to be judicious about which reviews are credible, especially when opinions are mixed. But when dozens of reviews show an unambiguous trend, it’s definitely worth noting.
Join an Honors program if you can. Certainly you can get where you’re going without one. But CC’s in general are strongly oriented toward articulating with CSUs, whereas Honors programs have stronger relationships with UCs. There will be more know-how as far as giving you the right advice, and there will be more of a well worn path to UC admissions, especially the more competitive ones. (For example, the Foothill Honors program has a particular relationship with UCLA.)