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.
The IKI Observatory is a remotely hosted astronomy setup in Castilléjar, Spain at https://www.pixelskiesastro.com/. FLO / Ikarus Imaging have sent out a setup in partnership with Optolong Filters and Starlight Xpress. The projects purpose is to provide a community based remote setup that can be collaborated on on Star Gazers Lounge - the data is made publicly available free of charge and the targets are chosen on the SGL forums.
It is up to you how you wish to approach image processing.
In the Auto mask generator, set the parameters you need to generate your mask.
The 'Un-glow' feature attempts to reduce the halos around bright, over-exposing stars.
You can convert everything you see to a format you find convenient. Give it a try!