Yes,what Square_peg says,and don't be afraid to do a bit of repair,on edges especially.
Outside of starting a dedicated Anvil thread it's difficult to put all the info in a few sentences.
I'd say make sure that the anvil is Alive(has rebound),that,if it's WI,it's face-plate is not too saddled,and that the face is,or can be made,smooth(as in polished,ideally).
One more thing-don't be shy of old American cast-iron jobs like Vulcan or Fischer,the trend would have them as an inferior article,and it's pure baloney.
They make an Excellent tool,i've had nearly 20 happy productive years with my 100# Vulcan.They're easily repairable,and in all ways practical and to the point.
And mine was nearly destroyed by the previous owner(USAF

...In a very common way:Non-users of anvils often believe that edges must be 90 deg.all around and sharp,it's a fallacy.
Such edges will ruin your work by nicking,and destroy themselves,taking chips out of the face along with them.All edges(with Possible exception of a few inches on the counter,IF you needs it),must be radiused.Commonly,the radius varying from 1/8" to about 1/2" towards the horn.