Sleeping through the night tips?

Erin
Hi all. I'm preparing to return to work and would very much like my 9 week old to be sleeping through the night by then 😋
He usually sleep about 5-6 hours at night now, waking around 3am to eat. Any fortunate moms have any tips for me to try? 
What time is bedtime? Do you feed right before bedtime or a little before? How much/often to you feed during the day (more small feelings or less large feeding?) 
Thanks very much!