Welcome to byc and to the fun-filled adventure of chicken keeping. Six is a wonderful backyard flock size, given your location I would suggest looking for breeds that are particularly suited to heat rather than cold so you can get away with choosing some of those Mediterranean breeds with light build and big combs/wattles (suits them for hot/humid climates)... added bonus, these breeds are also extremely efficient producers which is the feed to egg production conversion rate that they offer.
Leghorns, Anconas, Minorcas, and Andalusians are on the list that I would consider for putting a white egg in your basket. Is some find them to be kind of flighty or standoffish, but I have found that they can actually be quite inquisitive and personable. Our current leghorn and a leghorn-based hybrid are two of our absolute friendliest birds. George, the Leghorn, comes when called, does limited tricks, and can always be counted on to follow us around the yard and assist in any activities we are doing.
Crested cream legbars offer or whiting true blues are on the list I would suggest for a blue layer. The CCL has the added benefit of being an auto-sexing breed so you will avoid the risk of a surprise Cockerel if you're buying chicks rather than started birds who are of an age that they can be reliably sexed. For a green layer there are several options....marans based crosses are fairly easy to come by these days and can offer a nice Olive colored egg. Speaking of marans, that is what you're going to be looking for if you want to put a nice dark egg in your basket, welsummers are another option.
Depending on your tolerance for receiving a surprise male even if you buy sexed female chicks there is a 10 to 15% risk overall of receiving a male, looking to some of the fun autosexing breeds or sex linked crosses / hybrids can be a nice way to build your basket and flock without having to have a contingency plan for what to do with any unwanted boys. These days people are working with lots of lines that offer you the colorful eggs that you're looking for and the guarantee of being guaranteed sexed female.
Some of your most friendly and personable breeds are not necessarily going to be the best at it for a hot climate, due to being generally heavier bodied and having combs and wattles that are more compact which provide less heat exchange, but that does not mean that they should be excluded from consideration. Breeds like orpingtons, wyandottes, Etc are generally friendly and contribute light/medium brown eggs
