Most early companies are assembled faster than their documents. The product ships, people join, work gets made, and the legal structure catches up later — usually in a hurry, under someone else's deadline, when an investor or an acquirer starts asking.
The recurring problems are the same ones. Founders who agreed how equity would work but never wrote it down, or wrote it down without vesting. Contributors who built something important without ever assigning it to the company. Work created before the entity existed and never moved into it. None of these are difficult to fix early; all of them are expensive to fix late, because by then the fix may require the cooperation of someone who may not have a reason to cooperate.
The legal work here is narrow and concrete: forming the entity and getting its governance documents right, papering the arrangements between founders, putting confidentiality and assignment terms in place before people start work, and making sure the company actually owns the intellectual and other capital it is built on.
This is the legal layer only. Decisions about strategy, financing terms, valuation and how to run the business belong to you and your advisors; the Firm's role is to make sure the legal structure supports the decisions you make.
That is normal, and it is fixable while everyone is still on good terms. What it costs later depends on how much was left undocumented and who has since left.