Don't apologise, we all started somewhere!
I've got Hybrids, a Light Sussex, Dark Sussex, Speckledy, Bluebell and two Geeno Blues (white star crosses that lay blue eggs) despite the different sizes of the birds they all get along ok generally so pick whichever hybrids you like the look of. I like the look of my multicoloured bunch of reprobates ladies and the different egg colours look really pretty I the kitchen too.
Scraps of cabbage tied in a bunch, carrot peelings, pumpkin seeds, etc are all good, be careful with potatoes unless cooked and fruit though as they love it but too much will give them runny bottoms and bathing a hen is not an awful lot of fun.
Mine like lots of different perches, broomsticks, branches etc and the have a selection of tree stumps at different heights to perch on, they all tend to squeeze onto the highest one though. They are originally jungle birds so like to roost off the ground when not scratching around.
They should come fully vaccinated if you buy from a good supplier, you shouldn't need to top this up as it's supposed to give lifetime cover.
I hope this helps. 