Welcome to the board!
AEB = Automatic Exposure Bracketing, I trust.
The words ‘newbie’ and ‘simple instructions’ are inclined to steer my advice toward Darktable, a FOSS tool that is well represented here at pixls.us. This video tutorial may be helpful: How to make an HDR image in darktable. I think if you are new to these tools and want to merge your stack and get on with life, then that is the way to go.
G’MIC - the command line tool - is eminently qualified to slice-and-dice the dynamic range of your images in enough ways to make your eyes water, but if you are not familiar with accessing the command line tool of your platform, then, I fear, we are outside of the range: ‘simple instructions’.
That said, here is a basic introduction to the G’MIC command line tool. If you’re not intimidated by shells and have some specific and exacting compositing criteria that you are not sure how to implement, then ping here. Hope this helps.