I've done potential steps where V > E0 and V < E0, but not where it's equal to 0. How would I go about answering this question? Any help is appreciated.
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If $V_0=0$ then it simply means that you're talking about a free particle and the solutions to the free particle TISE are trivially given by the eigenstates of the momentum operator with each eigenvalue of energy being two-fold degenerate (check this!).
However, you can exploit the fact that $E\geq 0$ and treat the case of $V=0$ as the limiting case of the $V\leq E$ class of cases (you should be able to justify that the procedure for $V<E$ can also handle $V\leq E$). Since you have already solved this class of cases, you should be able to simply read off the case of $V=0$. Verify that this matches with the results obtained using the first bullet point.