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I would recommend reading and even bookmarking this page http://beautifuldragons.com/ . It is a very helpful site for new and old owners who have just about any questions on their bearded dragons. I too am a new owner and I am using this site all the time. Even when I go out to the grocery store...
Your question about how to weigh your bearded dragon, I would try getting a small kitchen scale ( the kind you weigh out vegetables and such). You can usually find them cheap and easy to use. I use one for my Zeke and all my ball pythons and it is great.