Nothing wrong with questions, they keep this forum running. The more the better. And don't worry if it is something that has been asked before. I hate the Search function here and besides, repeat questions are often easier to answer.
You have three basic types of meat chickens but variations within those types. Cornish X broilers are the ones the commercial operations use for the meat you buy at the store. They grow super fast, have a real good feed to meat ratio which means you don't spend as much for feed per pound of meat. They are typically butchered before the are two months old, any longer and their hearts quit or their skeleton breaks down. They grow that fast. You have to buy the chicks, you cannot breed them. They are tender enough that you can cook them any way you wish. You have to butcher them when it is time, you cant wait on them or they start dying. That means you have to have a schedule you can do that plus lots of freezer space.
The Rangers share many traits of the Cornish X but grow a little slower. They are probably a better choice if you plan on them foraging for a lot of their food.
The dual purpose are a lot like your laying flock, I don't know what breeds you now have. The dual purpose grow a lot slower so they don't have the health problems of the Cornish X and to a lesser extent the Rangers. But to get much meat on them you butcher them much later which affect how you cook them. Since you butcher them older the meat can have more texture and flavor, some people like that but some don't. Dual purpose breeds don't give as much meat as the others and the feed to meat ratio is pretty bad unless they forage for practically all they eat. You can bred and hatch you own. You can butcher them more on your schedule, they are not going to fall over and die.
This is intended to be a broad overview from my perspective, there are a lot of details in any of them. Hopefully others will chime in. Hopefully this will help you narrow your questions further. Some of these threads get really long with all the back and forth which I think is good.