Hello and welcome to Baby Whisperer. I'll try and help you out with your queries
If he is still sleeping at the 3 hour mark (and over an hour and a half to two hour sleeping period) should I be waking him up to feed
I don't think you need to go for a hard and fast routine at the moment. I would wake him up only if the nap was continuing for more than 2.5 hours, as it might affect the rest of the day/night sleep or if it was close to 3 or 4 hours since the last feed. Your supply is still being established and so it is best to nurse regularly. Also, at that time, I was a bit paranoid about dehydration.
When he wakes up early should I feed him right away, wait for hungry cues, or wait for the 3 hiur mark?
Is he willing to wait? If he is not fussing for a feed, then of course you can hold off. But feed if he is hungry.
If I wake him up should I feed him right away or wait for his hungry cues?
I thought that you were waking him for the feed? If not, then let him sleep:p
Is it too early to try and set a spefic wake up/bed time? I've been trying to get him into bed for 8 every night. Then when he wakes up in the night I put him back to sleep no matter what time it is and then wake him up at 8. An example this morning he woke up at 6 so I put him back down after his bottle and woke him up at 8 and fed him again to start the day.
Sounds perfect. 8 is a bit late though. Is it possible to bring BT forward? At that time, my daughter would also wake at 6 for a feed and then continue sleeping till 8 or 9. But as soon as I started waking her up at 7, the NFs stopped. So that might happen for you also.
With A time should I be trying to keep him up for the same amount of time after each feed or just as soon as I see that first yawn begin the settle down time?
At 6 weeks, I would go by sleepy cues but also keep one eye on the clock. For instance, my DD could simply not do 1.5 A before nap 1, despite sleeping through the night. She could only handle 1 hour. You will have to observe your LO and decide. It is best to keep A time absolutely low key at this age, as nearly everything is over stimulating for them.
Hope I got everything. Good luck!