Can't use pencil, paintbrush, airbrush, but can use text and fill tools.

[rich2005]

If the brush outline is not showing, the first thing to check

Is the brush set on the (empty) clipboard brush? That is it very first one.
Next is check the brush size, not so small you do not see it.

You do not need everything selected. Only select an area when required. Use Select -> None.