To sketch the radial distribution of a 3d orbital, specifically the $3d_{x^2-y^2}$ orbital, resources like Wikipedia's Atomic Orbitals and The Orbitron provide valuable visual representations and explanations. The $3d_{x^2-y^2}$ orbital has no radial nodes, as indicated by the formula $n-l-1$, where $n=3$ and $l=2$. The graph of the radial distribution confirms this, showing no roots. Additionally, there are two angular nodes that are perpendicular to the axis, which do not need to be depicted in the radial distribution graph. Understanding these characteristics is essential for accurately sketching the orbital's distribution.