Seasoning cast iron has been rather easy, and you can get preseasoned pans as well. My method is: scrub a new (unseasoned) pan well with hot water and a brillo pad, being sure to thoroughly get into any grooves. This is to remove the wax coating present on some pans and to clean any potential surface rust. From there I preheat my oven to 450°F/230°C with my pan inside, this helps drive off any remaining moisture. Once its to temp I pull the pan out and give it a thin coating of flaxseed oil before putting it in the oven upside down for 30min. I do this 6 times, flipping the pan each time, but really 3-4 times is enough. And any fat is also good, I simply prefer flax because it has the best polymerization, which is a debatable quality. I’m just excessive and cast iron collection is a bit of a hobby. After the initial seasoning all you need to do is store your pans in a thin layer of oil if you won’t use them for long period, but even that isn’t a real problem for properly seasoned pans. I’ve never had a pan I seasoned rust.

As for what you’re missing: nothing for cooking smaller foods, but it is unmatched for baking and frying. I’ve found it to be a lot more capable in keeping oil temps consistent and giving good crusts to pan pizzas and cornbreads. So if deep dish pizzas, breads, seared/fried meats and veggies, and huevos ahogados sound good I’d definitely recommend having at least one 10-12” pan around.