Most people add the BBQ sauce as the meat is being cooked.  Since commercial BBQ sauce is essentially tomato sauce with sugar and spices it burns during the cooking process.  It's a better idea to cook the meat and then add your sauce; burning it only if desired to achieve that "flame-broiled" taste.  If you feel you must baste the meat while cooking try adding some spiced oil; it will burn off and may moisturize the meat; and it looks cool and sounds great (hisss, hiss as it's cooking); nothing wrong with that; anticipation is 1/2 the fun!

How do I tell if my steak is done?  Give it a poke
Here's a method grill cooks use to see if a steak is rare, medium or well-done.   On you hand there is a muscle, as indicated in the photo on the right.   In the relaxed position, if you touch this muscle and then take a poke at a "rare" or still bloody steak on the BBQ; you would be surprised at how similar they feel. If you extend your thumb up as high as it can go and then touch this same muscle you would find it resembles the feel of a well-done steak.  Half-way extended would be medium.   Crude but effective.

Close the cover on the BBQ to make it more efficient and like and oven

Think about how heat works:  If you are cooking over an open flame you are certainly only cooking 1 side of the meat at a time.  This makes sense, but you will find superior results and faster cooking times of you close the lid during cooking.  This is more efficient and cooks all the meat in a more even manner, leading to superior taste.

Save time and dishes try cooking your vegetables on the BBQ at the same time.  Onions, garlic and peppers with butter in foil.   Nice...

I like my steak MEDIUM (PINK) How do I know when my meat is done?  Give it a poke.  Look at the muscle between your thumb and index finger.  In a completely relaxed position, if you poked it; if your steak felt like that; it would be RARE.  If you extend your hand about 1/2 way and give it a poke, slightly extended is about MEDIUM, fully extended (with that musle completely taut) would be WELL.   It's a cheesy trick; but one used by grill cooks for ages to quickly determine to color (RARE, MED, WELL) of a steak on the grill.

Do you love the taste of grilled meat but live in an apartment?  Why not get an electric grill?  If you live in an apartment, an indoor grill can seem like a good idea and does a reasonable job.