A 12" is large. Excellent for this pair.
The Flame nebula is also doable. While you are at the Flame, the Horsehead is also worth a crack. If you don't have a nebula filter of the UHC type, the Horsie is still achievable, but it will test your observing skills all the way to Hell and back,
. I have seen the Horsie without a filter in a 12", but it is a real trial. I'll post a chart in a little while to help out. This chart will help locate the asterisms that surround the Horsie. Remember, when looking for the Horsehead, you will be looking for a very faint black shadow on top of a black background. Slow and patient averted vision is your best tool. It is not a large feature. You will need to keep Theta Orionis out of the FOV too as it will wash out the field of view otherwise.
I'll post some other targets too you might like to try.
Mental.