Hi petran,
If you already have a .hdf file then transferring it to fs-uae is quite straight-forward. Just start fs-uae, and work your way through the tabs to set your Amiga Model.
Tab one: Choose your Model and Rom type.
Tab two: Avoid if you don't need a Floppy drive.
Tab three: Add a CD Rom if needed. or:
Tab four: Add your .hdf or System folder.
Tab five: Choose your default Rom and Ram specs.
Tab six: should auto mount your joystick if plugged in.
Tab seven: add a board if needed (same as win-uae specs) also add a bsdsocket.library if you added it in win-uae.
Tab eight: choose a dedicated CPU and Jit Compiler the same as you have in win-uae.
Finally save the config (test) and click start.
If it fails you may need to add an FPU:
Go to settings icon in the last tab and add something like:
uae_fpu_model = 68882
or
uae_cpu_speed = max
I assume you will use a backup copy of your .hdf or system folder, so any damage can be reversed. Just try it and see what happens. You will find more info here:
https://fs-uae.net/docs
wii