The short answer
Most founders can do the basics themselves, and should, at least until the money gets genuinely complex. A simple plan (emergency fund, term and health insurance, a boring index-plus-fixed-income portfolio bought through SIPs) does not need a manager, and many managers are paid through commissions that quietly cost you. Where paid help earns its fee is at real complexity: a large secondary or exit, cross-border income, structuring, or estate planning, where a fee-only financial planner and a good CA can save you far more than they cost. Prefer fee-only advice (you pay for the advice, not for products), and hire for the hard, specific problems rather than to run the whole thing.
A curated summary to orient you, not advice. The resources below are the real value.