They can be on the nippy side and "taming them down" will not only take time but a lot of patience and some hard bites thrown in for good measure.
I'd start looking on the web for all the information on cockatoo's I could find....
They are loud, they are destructive and they need a good variety diet.
I raised them and found personalities differ within the same species though some traits do apply within a certain species...
Two will be a lot to handle if you are a first time Too owner.... since they seem to have been raised together, are used to one another it amy be that you will have to buy a very large cage as the one shown seems rather small for a pair...
They are a pretty pair and congrats on the two new additions...