I have had chickens for a little over a year now. I started out with three pullets and got three different breeds to see what I liked. I later got 3 more girls and started them as chicks, again different breeds to try. I was glad that I started with pullets because they are a little easier to take care of for the first time.
If you want a chicken that is very friendly and is a good pet, I personally think Silkies are the best. (my avatar is a Silkie if you are not familiar with them) They are very sweet and silly and friendly. But, they are not good egg layers. You can always have a few chickens that are more pets and a few that are for eggs. For egg laying chickens I have liked Rhode Island Reds and White Leghorns the best so far.
My leg laying chickens were not very friendly at first but I would sit every afternoon in the yard very still and quiet and throw mealworms to them. I would throw them a little closer to me each time just little each day. Within a week they would eat out of my hand and now they trust me and are friendly.
For your research I would also recommend reading about apple cider vinegar and diatomaceous earth (food grade) to help keep your hens healthy.
Good luck!