What kind of chickens can live with a Dorking?

[LoveLuna22]

I was thinking of getting more chickens but I'm not exactly sure which ones to get. I have a Dorking rooster who's still pretty tiny (he fits in my palms) , but I don't know if I have to get Dorking chickens or if I can get different types? Please help I'm new to this.

 

[ChickenCanoe]

How old is a dorking cockerel that fits into one's palm?
Or is it a bantam?
Pretty much most breeds will work.
http://www.albc-usa.org/documents/chickenbreedcomparison.pdf
http://www.sagehenfarmlodi.com/chooks/chooks.html#f