yes it would be great to rescue that poor animal. yes it would be great to have a new beardie companion. Make sure he is not going from the frying pan into the fire. You obviosly care about animals and are looking for info before jumping into things (apparently more so than the person you are getting it from). If this person did not take proper care of this beardie you may be in for some vet bills. be prepared for that. You will need the proper setup. the tank, heat, UV Light is probably very important at this point for the poor Beardie, calcium, good food, cage furnature, a fecal from the vet... be prepared to invest in this poor guy. he is a rescue animal.
no matter how much better off he will be with you there is also the matter of the stress of moving. that needs to be minimized so learn a lot real fast. Read a lot of care sheets first, PLEASE. Make sure you can make the commitment in time to keep this guy the way he should be.
G-D bless you for rescuing the poor little guy. Good luck.
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Bennett

www.beardiedragon.com