I have a Bezier Objects, I want it to make it "solid"

I have a handdrawn object, as bezier svg. And i need smoothout the lines. I dont want to do it by hand :). And i need to merge areas to objects and fill the space in the areas so i can color it. I am working with wacom pro paper. I can “really” draw, wacom paper makes svg(extremly accurate) then i need to smooth out my drawings.