I need some advice

I, like all other new mothers, have a ton of questions. I need so advice from some experienced mommas out there. Here are my questions:

How can I transition my kids into sleeping on their own in their own cribs? They up to this point will only sleep for hours at a time if someone is holding them. These leaves us exhausted.

How can I make tummy time better for them?

Is it worth it to make a bottle/diaper/sleep log?

Thanks for any advice!