Paint tip: what to paint on
What is the best to paint on? For mix colors and do sketches will I recommend use of paper and paint board (see no 1 and 2 in photo). When you begin to made paintings will canvases, fabric ready, (no 3) be fine to use. Later on, for more permanent work, will I recommend flax canvas mounting on stretcher (no 4). If you want to do icon paintings will you probably adopt to paint on tree (no 5). I myself use earlier "building board" (no 6) for sketch and for smaller paintings. Regarding size see matchbox no 7.
A3 is a good size to start with.
Odd K. Hauge