I am a consultant that has has been involved with over 35 startups as an angel investor, VC, founder, CEO, Director, advisor, and core consulting in strategy, product/market fit, and corporate governance.

Needing an NDA at the initial phase depends on who you want to speak with about the project. Most people will not sign an NDA until they have a broad perspective about the project so they do not lose optionality if they do not engage with you. You should reserve the most sensitive areas of the idea until they commit to learning more at which time you can ask them to sign an NDA to move forward. Discussing and idea that may or may not be viable usually will not motivate a person to sign an NDA. I common fear with new startups is that a person will take their idea and execute without you. That may happen occasionally, I have not seen that occur in over 20 years looking at hundreds of startups. Ideas are easy, but change with knowledge and often evolve, so in the oft chance you do discuss with a person by the time you launch, the idea has changes significantly to where the NDA will not be applicable.

Having an NDA with team members is expected. A consultant will sign an NDA at the point they know if the project fits their skills and availability. An investor will usually never sign an NDA until they invest, then only as part of the closing documents. Potential customers will not sign NDAs.

There are many free resources providing templates. As suggested, you should acquire one, work through the language to cut down inapplicable material or add specific material, and perhaps then go to an attorney with corporate experience for a final review.