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Hi there,
there are many ways to achieve reasonable results and with experimentation you will get the right formula for your setup. I use a canon dslr and agree that the best way for focusing is to utilise the live view screen. I like to aim at a star with a moderate magnitude and focus so that the diffraction spikes are coincident(this is with a Newtonian) otherwise maximise the camera zoom function on a star and focus till nice and round.
The f10 is slow so you can afford to perhaps raise the ISO to 3200 for say 30seconds - 60 seconds and I would recommend 10 subs as a minimum to stack.
This would of course be a starting point to trial as the conditions and objects apparent brightness will alter your ISO and exposure time.
I understand that using a ha filter can be difficult to focus using a dslr particularly when the object you are imaging doesn't have any bright stars in the f.o.v. - therefore aim at a star as above and when happy with your focusing you can slew back to your dso.
Good luck Yoda, the fun is in having a go! I'm sure you will succeed.
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