Bearded dragons are solitary creatures and although two females will tolerate each other, there will still be dominance issues. I'd strongly suggest buying seperate enclosures for each lizard, as problems will go unnoticed for months until one decides he has had enough and then attacks the other.
I dont agree, I have had Obi and Matilda together for 3 years now they have never mated because Obi is a bit Simple lol But if one of them is missing (vets,bath,cuddles) the other goes black and gets really peed off.
In my opinon they are like people, Some will get along with others some wont....
See how it goes, If it is a male and female keep an eye he isnt badgering her to much... I cant even hold my Female by my other males tank as he is a sex machine and starts bobbing so hard I think his heads gonna fall off! lol
Good luck with them, and most importantly enjoy them! You will soon need more!!! lol.