B.,
As a baby he's going to do his own thing. They're all different. Good for you and for him for breastfeeding! Yay! That will help him the most.
Wearing him in a sling as much as possible will help you both - even after you go back to work. Co-sleeping/bedsharing may also help save your sanity - while it won't buy you more sleep guaranteed, sometimes all they are doing is looking for you and once they find you (with a hand or foot) they are back to sleep. My little guy does that, though NOT AS MUCH AS HE DID WHEN HE WAS FIRST BORN!
There are few restrictions on bedsharing: taking drugs or alcohol, using drugs for a psychiatric condition (contact La Leche League for those!) or sleep apnea. Your baby is old enough you are very unlikely to roll over on him.
Good luck,
M.