Second what the first responders said in that it's too early to worry about a 'rod for your back' and also don't get too hung up on websites and what you're supposed to do.
Saying that, there's no harm in introducing a routine at this age - it's as much for yourself as it is for baby, in that you have some structure and some planned quality time with baby.
By about 4 weeks, we noticed DS was getting sleepy at more or less the same time every evening - sometime between 7 and 8 (bearing in mind he obviously slept A LOT at that age!). So I would bf him wherever in the house, and then bring him to the nursey for a nappy change and massage, with lights turned low and nice music in the background (again, as much for me as for him - and my choice of music of course!). It was just a nice way to wind down from a busy day - that's all a routine is at this age. Some would say that a bedtime routine is a message to the baby that 'now it's time for a longer sleep, not a nap like during the day' but that age, I didn't think so and sure enough it didn't happen - he slept erratically in those days no matter what I did.
But pretty soon, the bedtime routine became the best part of our day - DH would come home and we would do the massage together (either taking turns or doing one side each) and then one of us would sing to him for a little while. Did he ever get the message that this means bedtime? Who knows?
He's now 10 months old and the bedtime routine has naturally changed - he's too wriggly for a massage now (oh I wish he wasn't!) so now it's nappy change, crawl-chase for a bit, get into sleeping bag, story, song and pop him in the cot to chat to himself till he falls asleep (usually needs one more visit before he falls asleep). Again, it's as much a structure for my day as for his - I like the steps and I talk him through them as I do them.