I was a newbie chicken keeper three years ago and the best advice I can give is 'don't worry be happy and a take it as it comes. Your chickens will soon have you trained and doing what they like!!
We bumbled our way through from the beginning, starting with 6 and we now have 10. If a problem came up we researched it and dealt with it.
Don't get too hung up about how do it. Just feel your way into it. So they long as they are kept clean, fed and watered they will reward you with eggs and loads of fun. They all have their own personalities.
If you are going to give them treats, e.g fresh vegetables etc give it to them in the late afternoon or evening otherwise they will fill up on treats and not eat the layers pellets so you will not get so many eggs. That was ine we found out the hard way.
Also get them to take the treats from your hands and get them hand tame. THis will make it easier if you ever have to catch hold of them in a hurry.
We had some right escape artists. the chief one's name was Nutty. A reason for that! SHe would find a way out and lead all the others out to the tomato plants! Or if I were hanging out the washing I would look down and find a flock of chickens round my feet, OK if you are around all day but a beggar if you want to nip out to the shops and have to round them all up.
As for vacinating or not and not mixing vacinated chooks with unvacinated.
We got our girls from a reputable source and they were all vacinated. Four of those have died over time but the one we bought from the farm that we stay on holiday at, wasn't vacinated and she is the fittest of the lot. A beautiful cream legbar that lays gorgeous blue eggs.
So, don't stress, enjoy them, watch them and you will soon learn what you need to do. They are the most amazingly funny timewasters on the planet.