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A good start Carl.
Planetary imaging is arguably the sternest test of any type of astrophotography, regarding collimation, focus & the relationship between the ambient temp and the temp of your primary mirror.
Working at very long F/L hi-lights any slight error that would go unnoticed under normal conditions ie; observing at the eyepiece or imaging at prime focus.
Personally, I go to extreme lengths with my collimation and control of my primary mirror temp.
I cannot overstate just how critical collimation is for planetary imaging.
I think the best advice I could give to you is to concentrate on the basics and learn by your mistakes and above all else, enjoy the experience.
Regards
Trevor
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