MOST babies are easy-ish to put to sleep when they are new. And the more you encourage good newborn sleep habits, the better they WILL sleep in the long run. I honestly think that one of the biggest things I did wrong with my first was that I didn’t put him to sleep ENOUGH. If your newborn wants to sleep 20 hours per day, LET THEM.
I do think that the success or failure of naps for 2 kids under 2 hinges mostly (unfortunately) on the attitude of your toddler. If you make your toddler feel included, and let them “help” with the baby, chances are much better that they won’t act out to get your attention.