Can two crested geckos a halmahera and a golden gecko live together in a large terrarium?

I do not recommend it. The crested geckos are fine together, but you mention their your first lizards, halmahera geckos are a bad idea for you right now, and so are golden geckos. A very skilled herptoculturist can mix species, but you are not therefore you should not. Even being skilled with reptiles it is still very difficult. Do it if you must, just realize that there is a very high chance of one or all of your animals dying quickly in those conditions, and thoroughly examine each of the species care, do not sacrifice one species requirements for anothers. In all other aspects in life you can compromise, but in this case compromising one species needs to fit anothers will bite you in the @$$.