You start by having a good reputation and track record for designing reliable power supplies.
You do a formal SWOT analysis, to find what you should avoid doing, e.g entering a crowded field without an obvious USP, or where you have weaknesses relative to established businesses.
You don't adverise, you sell your capabilities to people that know your (good) reputation.
You add people you can trust, as and when you need them. You don't add "friends" (or relatives).
A company is the least of the issues.