I used to paint with water colors, but over the past few years started using acrylics and love them.
What kind of watercolor paper did you use?
I'm a novice at painting, but for water colors I would try to find a heavy weight paper specifically for it.
Do you ever paint with acrylic on paper?
Not usually.  I use canvases for that most of the time.  I have used acrylics on heavy weight sketch paper. 
Do you ever sell your paintings?
No, I have never sold one.  I've thought about it, but always figure no one would really want them. lol
You never know. How do you decide what to paint?
Usually I have dream that sparks an idea, or I read or hear something that creates a picture in my mind.
I wish I could do that. Do you ever get artist block?
Sure, sometimes I go weeks with no ideas and no motivation.  But then something comes along.  It's always in waves.
That makes me think of the beach and seaside.