Enjoy yourself with it and just get used to the camera by taking as many pics as you want - that's the great thing about digital - once you've got the gear is doesn't cost anything to take the pics!
As for technicalities, as has been mentioned on here, a shutter speed of 1/500sec will be OK, in most cases, to stop movement, but still allow a small amount of prop blur:
http://paulcoulthread.fotopic.net/p41941033.html
(tech specs: ISO200, 1/640 @ f/11, lens at 110mm)
If taking pictures of aircraft, get used to 'panning', following the moving aircraft as it passes and gently press the shutter relaease when you are happy with positioning in the viewfinder - and don't forget to 'follow through' - keep the panning movement going
after you have pressed the button:
http://paulcoulthread.fotopic.net/p42015204.html
(again, ISO200, 1/500 @ f8, using a 70-210 lens)
I do have a number of photos taken from aircraft cockpits, but not on my website - main points, look out for internal reflections from the canopy (don't forget the position of these will change in relation to the direction of the sun!), avoid banging the lens against the canopy and, above all, if you are flying the plane as well, that takes precedence over the photography!!!
As for the 'brand bitch' comments made (not at me, I realise), I work in the photographic trade, have changed from Nikon to Canon (helped in no small amount by the aftermath of a divorce!) and have been quite impressed with the Pentax digitals.
Like I said, get out there, enjoy yourself and, looking at my watch, it's nearly time for bed, so don't stay up all night playing with your camera and reading the manual ('tho Pentax manuals
are probably the best in the business!)