advice please

Am
Is anyone having trouble getting there 4month old to sleep?  I ebf and I find he falls asleep on me feeding but when I go to move him he wakes up.  Also,  he will not sleep on his bed flat in a bassinet he loves his car seat tho:/  can someone please help me figure out how to help him fall asleep in bassinet again and more so fall asleep on his own Instead of on me.  Advice is  Greatly appreciated