Routines can be useful, but not at this stage. You'll probably just stress yourself out more by trying (and probably failing) to institute a routine with a newborn.
Your baby is teeny tiny and her bio-rhythms aren't established yet so day and night mean nothing to her. This tends to happen around 6 weeks (I think). Until then, she'll be in a cycle of a few hours of sleep at a time (at the most).
If you are BFing, then you are still probably getting your supply sorted and it's really best to demand feed. It may feel like she feeds and sleeps randomly/all the time, but that's normal. They tend to cluster feed in the early evening, too, so a bedtime routine is nearly impossible. For me, cluster feeding went on for about 12 weeks.
What worked for us was we kept DS in the moses basket with us downstairs in the evenings and then took him up to our room when we went bed. He would sleep for a few hours (say 7-10) feed and then sleep again. This went on for probably 8 weeks until we started to give him a "bedtime". He would still wake up for feeds, but at that stage he was going slightly longer between feeds so it made sense to take advantage and get him upstairs (still in our room).
A bedtime "routine" didn't really start until 14 weeks or so when all I would do is the same things in the same order (not necessarily at the same time). And by no means, did I do this religiously. I still demand fed and was flexible with times.
Give yourself and your baby some time. Sleep when she sleeps, etc, etc. Good luck!
(Oh, and 2-3-4 is quite good when they are older - a very flexible and quite natural schedule to fall into.)