Miroro, I have a blog. Which you would be bored to death of my addictions and artherapies.
Like I said, those are really lousy sketches and meant to filled up a broken sketchbook

You can do watercolour without lineart / sketch, those are real painters, they paint by shape unlike us draw-ers which create art by lines.
If you need base sketch, you can use some hard h grade pencils if you don't want the pencil to show. If you want dark black line, check for waterproof pens. There are quite a lot of them, most technical pens are waterproof. Beware of water resistent, cause it does not mean waterproof.
Paint, Brush and Paper for watercolour seemed to be quite a big deal. I had been watching youtube on those materials and there is some tiny witty difference. Right now, I tested one no brand thick paper, and it really does not act the way as the expensive ones do. :< As for paint wise, I can't differentiate yet. I use just merely good range brush now, not picky over it yet.