Welcome to YT! With the biting, I just kept yelping like it hurt really bad even if it didn't, and then gently held their mouth shut while saying NO BITE! Then I let their mouth open and said, Just Lick, and they would lick my hand. Now they just lick me to death and don't bite anymore. As for the never wanting to be left alone, when you find the answer to that let me know!
My two never want me to leave and they'll wine at the living room door even when I just go to grab a snack from the kitchen. Spoiled brats
Good luck with everything! Keep us updated with how it's going!