There is alot to consider if you plan on getting chickens. Here's some thoughts.
Do your homework before you purchase so you know exactly what and how many. Have housing built in advance and a book on care and what to do in an emergency.
If it's just the two of you, starting with 6 would probably be ok or you may have so many eggs you won't know what to do with them.
Consider if you will start with chicks or older birds. If you start with chicks and it's cold you will need a heat lamp for them to go to to warm up. They don't need to be in the heat all the time, but will need access to it when they get cold.
You'll need a coup for them at night as shelter and for a place for them to lay so you can find the eggs. You don't want raccoons, foxes or stray dogs dining on your chicks at night.
If you travel you can leave them for a day, but then someone should check on them for food and water.
Where you live and the heat or cold climate will also help you to decide which breed of chicken to get. The heavier breeds don't do well in very hot summers. Some of the lighter breeds like Americanas like to hang around in the trees. Even the type of comb on the roos can be a problem if you live in a very cold climate as they can get frostbite.
You'll need to decide whether you want the small bantams or the standards. Millie in Virginia says:
Many breeds come in both sizes, but there is more ornamental type variety in the Banties. My personal favorites in the calm variety are Cochins & Brahmans (feather footed), Tophats - Golden & Buff Polish, Crevecour; Buff Orpingtons and Black Australops. The last two are dual purpose standard sized breeds. When they stop or drastically reduce laying around 2-3 years of age, you can slaughter for meat. Leghorns are very good layers of white eggs, but very neurotic. Ameriaucanas lay pretty blue and khaki colored eggs and are neither docile nor aggressive. Rhode Island and New Hampshire Reds are also good layers, but we've found them to be more aggressive. This is all observation on our homestead, where the chickens free range. If you have kids or just don't want roosters, you don't need them to get eggs.
I've heard that Buff Orphintons are generally the quietest and nicest.