Hmm, interesting question! I have 3 between 9 and 13 so to be honest when they were little (all born within 4 years) I hardly had time to stop and think what I was actually doing. I would say go with your instincts and things will turn out fine. The fact that you're thinking about what you're doing means you're probably doing great.
Sleeping and toilet training....feels like it goes on forever but becomes a distant memory before too long. It was important to me that my dcs went to bed when told and slept in their own beds, but to others it's not.
Don't give up on serving healthy, varied meals when they go through the fussy stage. Mine all came out of it and eat most foods now. Try to keep things relaxed at the table.
One thing which didn't come naturally to me, probably due to my own upbringing, was letting them experience negative emotions and not necessarily fixing every problem. Sometimes they just want to vent a bit.
Things I wouldn't stress about if I had another (which I won't!) - not sharing as toddlers, tantrums, early/late reading/writing, being clingy, getting dirty, not wearing a coat.
Things I would still consider important if I did it all again - knowing the parents are in charge and have authority but that the dcs can come to you for anything without being judged, good manners from an early age so it becomes a habit, helping around the house, giving responsibility and letting them do things for themselves as appropriate for age, learning how to behave in different settings (restaurants vs. park for example), being consistent and following through with consequences.