Primed

So primed and ready the canvas stands waiting for the first mark. As usual I am hesitating, its the nervousness I have, similar to that on making marks in a new note book or sketch pad. I need to delve in and make a commitment. I'm meant to have got over this initial feeling as I've painted the base coat...... but ......will it all turn out like I imagine it?
Will it?
The blue I've coated the canvas with, is bold and intense, a gorgeous rich colour. Colour of kings. However the finished painting - or the one of my intention - will be far cry from this colour. I'm hoping it will be far paler and more delicate. Will this domineering colour take control and take over? Its there to add depth to what could be an almost white background colour on the finished pic. All I want to do now is cut out some bright orange fish and stick these to the painting - maybe add some seaweed.

Its time to start, but how? Should I outline in pencil - paint the initial structure in paint - paint the background? It turns out I'm doing all three depending where I'm painting on the canvas. My, its a big canvas and why did I chose this small brush?