Geckos in general are easy to take care of, And so are Bearded dragons, The Beardie are one of the most popular lizards out their and have a lot of stuff made for them. I prefer Uromastyx's but require a basking spot of 110 to 130 and that can be a chore in itself.
IMHO beardies is not a beginner lizzard. they have specific requirements with the higher temps,light cycle,uvb and so on.
Your best off with crested or leopard geckos as they both do not require special lighting and are cheap to feed and care for.