Hi, welcome on board!!
I first spent a few days just keeping note of my baby's own routines - feed times, times when most alert, bedtimes.
Personally I tried to implement EASY a little bit at a time. started with bedtime, having a set routine (bath, jammies, feed, bed) when I noticed my ds was getting tired - bedtime has become earlier as he's got older.
By keeping track of his own natural rythms I was slowly able to bring him onto three hour EASY, slowly streching out the time between his feeds to do so. At the end of the day, EASY isn't a rigid schedule, if he feeds 15 mins early or naps a little less, I don't sweat the small stuff.
If you check out some of the message boards, there's loads of good advice about setting up EASY for your lo.
Good luck!