A vital hint. Don't delete your video captures because they look swimmy. Keep EVERYTHING you capture, initially you'll get poor results but as you learn and try different programs you'll find ways to VASTLY improve the images using the same data. I learnt the hard way
You'll need tons of hard drive space too of course.
Grab yourself PIPP and AutoStakkert! too, both free and will help with different issues. Registax can be tricky to align frames if the target drifts, You can use PIPP to center the target and output uncompressed cropped images with say jupiter only and that will help registax. Autostakkert is similar to registax and can give you a pretty decent sharp planet shot plus it can do great work on surface footage of the sun and moon too. BTW mostly all you get doing planetary is just the planet and tons of black. So recording a region of interest or PIPP cropping to a smaller size helps a lot. lots of megapixels at the camera dont matter, you want lots of frames in a short time (few minutes) to try to not lose possible detail as your target planet rotates. learn and enjoy, dont let initial disappointments put you off, those are normal for everyone.