For songs with one vocal, I use one track. If I add a second vocal for harmony, I use two tracks. If I have a lead and two part harmony, I use three tracks. If.........well I'm tired of that progression already. I usually track with some compression, but only use as much as it takes to settle the peaks down just a bit. When mixing, I use just a tiny bit of reverb, usually a "room" reverb or a "reverse" reverb - I love reverse reverb on some vocals. You can use a bit more reverb/pre-delay and compression on backup vocals than on the lead vocal to kinda put them behind the lead. I usually pan the lead vocal straight up in the middle with the backup vocals panned a little bit to the right or left around it, DEPENDING on how I want it to sound for that song. If you want your vocal to be huge, you can put some stereo chorus on it.. slow modulation, low depth, widen the stereo image to where you want it. A cross delay will do the same thing.. a delay with settings for right and left... set one side a little longer than the other... If you want different setting for chorus and verse, use whatever mixing automation that you have, if any, to change the settings at those points in the song.. or just man the faders, pan knobs etc. at playback. Of course, only you, through your own trial and error process, can determine what you want your stuff to sound like. Just spend about a thousand hours mixing up some vocals. Something will shake out to your liking by then. Hope some of this is what you were asking for. If not, I am a total failure and must hang myself.