My number #1 accessory for cast iron is a Duxtop Induction Cooktop (one burner). If you can't find it yourself on Amazon I would skip the cast iron skillet and work on that skill first. . Someone commented on the heat retention but I find that with an induction cooktop I get very good temperature control. Maybe its just me, but I just don't notice a problem and I am picky about my eggs.
Another person commented on cast iron woks and I echo that. I found a flat bottom cast iron wok (and again you can probably find it yourself on Amazon) and it works very well with the induction cooktop. Probably better with a gas stove that blasts heat, but for me I can cook things (fried rice with eggs) that are much better than any other method I know of.
Just my 2 cents and an apology if that is not an affiliate link. I am so used to seeing them and wondering if the review is affected by the profit that I now suspect everyone. I don't mind so much when people announce them.