Hi gemma - I think it is possible to get a BF newbie into a routine despite what many might say, but I think it depends on your definition of routine as it changes all the time as they grow anyway, and of course needs to reflect the needs of your DD primarily.
I've done it twice loosely based on the dreaded gina ford routines (ducks) (disclaimer, would totally ignore her breastfeeding advice about fixed number of minutes etc). You just need to make sure you treat all night feeds as night feeds, get them up at roughly the same time each day (eg 7am), and make sure they are not awake for too long in any one session (will depend on your DD, but at 6 weeks probably 1-1.5 hours or so unless she's particularly spritely), aim for a morning, long lunchtime, then an afternoon nap, and aim for a bedtime by eg 7pm as well - all just common sense really rather than a fixed 'special' routine. You just observe what your DD seems to want to do, and then try to tweak here and there to fit in with what you want as well.
However, I think its a possibility that your DD is permanently attached to you in the day because of the bottle at night. I'm sure someone more knowledgable will be along to help, but from what I recall its the night feeds in the early days that are particularly helpful in keeping your supply up. If you've dropped them, then your supply could be a bit low in the day, hence the constant feeding? Just a thought, ignore me if I'm wrong.
Also, I would say that although its good to start trying for a bit of routine at 6 weeks, you shouldn't expect miracles! They're still pretty teeny tiny and can't wait if they are hungry or tired. Good luck...