how to get baby to sleep in his crib? help!

Ruth

Lyle is 14 months, I nurse to sleep then transfer him to his crib. he still wakes multiple times a night. I end up sleeping with him in my big armchair that I nurse in. well I'm exhausted. I haven't had more than 4 or maybe 5 hours sleep in well over a year. I'm back at work. I need help!