I've been searching and Did some good drawings on it, just lines though, I used it for an AT today

I use sai but I'd need specified questions...

Well...I recently started using it as well.

There really arent any "filters," only hue/saturation and brightness/contrast. I use the "linework" layer for my lined works usually, it gives the smoothest lines. That's found right next to the "new layer" button. The "Marker" tool works best for sketching, especially at 1pt size and like, 70% opacity.

There is one thing to look out for, the pressure sensitivity on SAI is a bit high for me, my lines always come out smeared because it is really touchy.

Then again, knowing myself, I probably set it up wrong, so XD

Hope this helps! c: