Well, my kids all know what will get them a spanking.
Disrespect to parents (mouthing off), telling us "no", or directly doing opposite of a command, lying, hitting or biting another child (or themselves

).
Usually we give a warning if appropriate, but sometimes they just end up with a spanking (if it's lying or disrespect). We ONLY spank over clothes, diapers included for the little ones. I absolutely do not support bare bottomed, it's humiliating for the little ones.......we use a wooden spoon, 3 measured, quick swats (tested on you first to make sure it's not too hard). Always in another room away from others (we use the bathroom), always talk before so kids understand why they're getting a spanking, always hug and pray and talk afterwards. I always make my kids tell me and the Lord that they are sorry for what they did, and why they are sorry. I make them look in my eyes, and talk to me about their thoughts, and understanding of the situation. They always leave settled and content.
My oldest was a spitfire when she was a toddler, and when I would give her a time out she would yell at me, and leave her time out, then get a spanking for disobeying and disrespect, then I would make her complete the time out for the original offense. Some kids are more strong willed than others. My other 3 have not had that much of a strong will, and they haven't needed quite as many spankings. We save the spankings for the biggies, though, and they are done in a well planned, private environment surrounded by lots of communication, prayer, and hugs.
Also, there is another thread about alternatives to spanking, seems you've read through it before, but look up some of that stuff, too. The more well-rounded info you have on parenting and discipline, the better you'll be at it!