Whole milk questions...

Hi moms!! I'm a FTM and my son is 11 months old. I really want to start him in milk soon but I'm not sure where or how to start so I have a couple of questions...

Should I just start giving him whole milk one day? Or should I do half and half like I've seen other moms say they do..

If I do half and half.. he drinks formula so does that mean I'd do 2 oz of formula and 2oz of milk??? = 4oz (just an example)

What kind of milk do I give him??

Whole milk? 1%? 2%??

How will I know if he's lactose???

I heard some moms say the doctors tell them to start with lactose milk to make sure they're not allergic or something like that..

Also if you're already giving your baby whole milk do you give it to them cold, room temp, or warm?????

What do I do if my baby refuses to drink the milk? What if he doesn't like it???

Sorry so many questions, just a curious/concerned FTM lol.

Any advice is much appreciated.