Sorry you don't have a grill! That's a big help.
Even so, look at grilling tips online. Most will tell the same things: let the steak warm a bit on the counter before cooking so you don't overcook the outside while the middle stays cold. Don't overcook it -- it takes less time than you think -- but use lots of heat. You want to sear the exterior a bit to seal in juices. After grilling... er, cooking... let it rest a few minutes.
Most of that advice should work inside as well. Just make sure you use the vent fan so you don't set off a smoke alarm.
Life is short: Void the warranty.