Putting kids to sleep help!

So I have a 3 year old and 10 week old. I’m trying to figure out how I will make this happen. If I can remember when I went back to work with my older one. I’d rock her with a bottle and read books. I spent the time to get her down which took time. She now goes to bed around 8 pm. Anyone with a baby and toddler...how do you put your kids down? Who’s first and who’s second? Anyone with both kids sharing a room - how do you put them both down? I’m starting to feel really guilty cause I’m not going to be able to dedicate that same time/attention to my second child as I did my first to establish routines. Any advice is appreciated and hearing what you all do!