3
I would create test points (in the schematic) that are the width of the traces with nothing but copper for the footprint, then place them where you want the traces to go. (not a great solution but one that works). If the autorouter sees the pads in the polygon then it will try to route the traces there.
However, the autorouter is difficult to use and does ...
3
Decrease the size of the automatically generated paste feature to zero (by making the paste mask expansion a negative number).
Then add whatever shapes you want to the paste mask layer using the Place Region command.
2
Assuming that you are a beginner, start off with a simple circuit on a single layer. Do as much as you can on a single layer. If you feel that a single layer is not sufficient, move onto two layers but preferably distribute the network across both layers instead of allotting them disproportionately with so much more on the first layer than on the second.
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1
More than 2 layer PCBs are needed in compact or complicated designs. Often when no BGA, or any smallest components are used it is enough to use 2 layer as long as required size of PCB is achievable. By the way the routing itself is not so difficult as a proper schematic, or component placement design. So I advise not to worry about multi layers, layers are ...
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