discipline and bedtime weaning questions

So, I have a couple questions here:

1) DS is almost 13 mo old. What type of discipline do you use or when do you start? He looks at us, at times, like he knows something he's doing is wrong, but I'm not quite sure how to go about disciplining or beginning to when he's only 1 yr old.

2) DS has been off daytime bottles since the ok at his 12 mo appt almost 1 mo ago. He does great and there are no issues. That said, he still gets a bottle at bedtime. Part of me is too scared/hesitant to try weaning that bottle right now. Pedi says by 15 mo, he needs to be off that one. I totally agree; I'm just afraid of messing with something that isn't broken when we have A LOT of stressful things going on right now...When did you wean from the bedtime bottle and how did you do it????

 TIA