Purple Heath, here are a few combinations of woods that you could try;
Ash drill on a Willow hearth
Cattail drill on a limewood hearth.
Elder drill on an Elder hearth.
Elder drill and a Willow hearth.
Elder drill on a Pine hearth.
Elder drill on a clematis hearth.
Hazel drill on a willow hearth.
Hazel drill on a Crack Willow hearth.
Hazel drill on a Limewood hearth.
Hazel drill on a Pine hearth.
Hazel drill on a Sycamore hearth.
Ivy drill on a Ivy hearth.
Ivy drill on a Hazel hearth.
Ivy drill on an Alder hearth.
Poplar, Limewood and Cedar should work just fine on a cedar hearth board.
Sycamore drill on a Sycamore hearth.
Willow drill and hearth.
All have been used with success by members of the forum, the elder and clematis combination has been quite good in hand drill usage.
I believe that Gary has a hand out on bow drill practice, if you ask him nicely he may send it to you
Generally keep the drill level, start slowly and steadily. When the smoke thickens and spirals around the drill, speed the bowing action up then the smoke should get very thick around this point you should have managed to get an ember in the notch.
The dust that forms the ember should be fine and very dark brown to black to view, if the dust is longer and lighter in colour it may be that you are rushing it and the dust is not getting hot enough to form the ember properly, I hope this will be of use.