How do i establish a bedtime for 2month old?

my baby is almost 2 and 1/2 months old. this is my first baby and im just not quite sure how to establish a bedtime. i try a routine like bath,bottle,bed..but it doesnt work. i try to put her in bed when she looks a little sleepy but not over tired so she can learn to fall asleep on her own but she just cries bloody murder and wont stop. some people tell me to let her cry it out and ive tried that but she wont stop and fall asleep. i just dont want her to think im always going to come get her everytime and rock her. i already got her on a bad habit, every morning she wants her seven a.m. feeding and she wont go back to sleep unless i put her in bed with me (the safe way of course)..but during her night time feedings she will go right back to sleep in her bed just fine. another question i have is when will she sleep through the night? shes up every two hours to eat at night?