Yes, calcium is the most important thing. The simplest way to do that is to buy a cuttle fish bone from your local pet store (they will be in the bird section). Don't add live plants as most apple snails eat all plants. If you want plants go fake. Decorate anyway you want. Don't worry about a filter and if the room temp is generally stable a heater really isn't needed either. A heater would be nice if the room temp drops a lot (for instance if the tank is near a window). Weekly water changes are nice to avoid a foul smelling and looking tank. Keep a tight lid on the tank as some snails may decide to go for a walk.
Feed a variety of fresh veggies. I start with frozen peas, zucchini, lettuce, spinach, celery and cucumber.
They are very simple and if well cared for live a nice long life and get super big.