Leopard Gecko's and fat tailed Gecko's are probably one of the best for 1st time Lizard owners and the 25 gallon tank should be fine for either of these types. They breed in captivity quite often so you may actually find one from someone locally via some type of reptile association or something. Bearded dragons are quite nice and fairly easy to look after IMO, but the 25 gallon tank wouldn't be even close to the space they would need.
Good luck
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