Welcome to BYC~!!
I got my first chicks last October, after much research which really didn't mean a great deal, although I thought so at the time.
I reviewed the Breeds Index on BYC, checked other online resources, and determined which dual purpose chicks I wanted. I "thought" four should do it. The basic four good layers amongst dual purpose birds: Rhode Island Red, Plymouth Barred Rock, Light Brahma, and one of those green egg layers: "Ameraucana" - really an Easter Egger. All from a local feed store: Bradshaw Feed in Sacramento, CA. The Brahma "failed to thrive" so I had to replace it with... two chicks. (Couldn't just come home with ONE!) That week the feed store had sold out all its Light Brahma pullet chicks, so I got an Australorp and a Silver Laced Wyandotte. Anyway, I eventually ended up with 7 chickens (through some sad "attrition" events.) One pullet chick - the "extra" EE - turned out to be an accidental rooster. Ah well. He's lovely, I'm keeping him.
Then a few months later, I bought two laying pullets from another BYC member who was down-sizing her flock. Lakenvelders. I liked that they are an endangered breed.
When chick season started in February, I bought four more chicks and two ducklings. From Bradshaw Feed, which is the local feed store I adore. There's another, closer one in town, but I prefer Bradshaw Feed, despite the convenience of the other one. Two Welsummer, which they had held for me so I couldn't just take ONE, and a RIR and Plymouth Barred Rock to replace those of my "original flock" killed by my elderly dachshund.
Then I picked up two bantam cochin chicks when they and my four new chicks were six weeks old. Those I got from a breeder about 25 miles away. (Answered a Craigslist ad.)
I know a lot more now, and while I still prefer a colorful and varied flock and am currently maxed out (actually OVER legal limits), I cannot add any more poultry. I am much more interested in the heritage and/or endangered breeds. Pretty ones.
Ones that look like chickens, not poodles. Or buzzards. Had wanted regular sized cochins, but after driving 25 miles and seeing the bantam cochins, I couldn't resist them. Fluffy Midget chickens!
Had my local feed store NOT been able to offer Welsummers, I might have ordered from MyPetChicken. I'd love to get a Buckeye, but see above: over legal limit. *sigh*
I recommend you stick with your current flock for now, and wait til next season before you add to them. You'll make better decisions about what you want to get, then.