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Welcome!
I recommend Sky Atlas 2000.0 Deluxe (colour) as it is beautifully presented and labelled. However this chart and many other free ones only go down to mag 8.5. To complement it I also recommend Sky Atlas Companion that lists all objects by chart number.
Note you will soon run out of stars on any 8.5mag atlas with your 12" telescope and an alternative or to complement the Sky Atlas would be Uranometria (3vol set as a list of all objects by chart number is in vol 3).
Sky Atlas is large (A2) and easy to follow. Do not worry about up/down (north/south) labelling orientation, just look at how the stars are plotted in relation to each other. (Think triangles!)
If you want more stars again then the Millennium Star Atlas is very nice although the paperback version does not lay flat but the hardback one is out of print.
Now if you dont want any of the weight of the books may I suggest the Argo Navis which has all the above mentioned and more in its database. (Even with Argo I still recommend Sky Atlas 2000.0 for a visual reference on where you pointing).
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