Sleep training 16 week old help!

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I need all the tips and advice on getting my baby to sleep in her own bed!! And to go to sleep before 12!! We breastfeed and I have been getting her dressed for bed and in her sleep sack and diaper changed and nursing her about 8 every night and every night she finally goes to sleep about 10:30 and I lay her down and within 15 minutes she is back awake!! And by the time I finally get her to sleep it is a feeding session later and 12-2 AM and Im exhausted, or have fallen asleep trying to get her to sleep! I don’t expect her to sleep all night just in her bed the 2-3 hour stretches that she does sleep and If I could get her to go to bed before 12 that would be great!! And she is getting where she barely naps during the day! What should a 16 week olds nap schedule be? I know she gets tired throughout the day but she will falls asleep nursing and I lay her down and she wakes up!