Yes, welcome! You will meet many great people here who will always be happy to help! We love to see pictures so please feel free to post! We look forward to learning more about your animals and yourself! Welcome from all of us at BYC! How old is this little one? That could help a lot? But, the comb and wattles look like they are growing....
This doesn't look like an ISA, which is a form of red sex link. If a female, she would be reddish of body with white flight and tail feathers. If male, he would be more whitish in body with red wing bars and red in the tail.
That said, How old is this bird? Where did you get it? It is a buff something, but I wouldn't say its a buff Orpington as the legs are the wrong color.
How old and where did you get it? Both males and females are chickens. It doesn't look like a RSL to me. If you got it from a private individual it could very well be a RSL cross, but that wouldn't make it a sex link.
No it is not an ISA Brown. It is a male and probably a cross of something or could be a Production Red. These are from a project I was working on many years ago. These are ISA Browns. In the first picture the male is the light colored bird in the middle of the picture. Not sure of your breed but good luck and have fun...