If you are looking for datasets from amateur astrophotographers to practice with, there are a number for useful resources.
Processing is meant to be fun! If you really need help with a particular dataset, jump on the forums or contact us directly for some pointers - even if you're just using the trial.
Even the way StarTools displays and scales images, has been created specifically for astrophotography.
It is up to you how you wish to approach image processing.
You can convert everything you see to a format you find convenient. Give it a try!