Being captain of the startup the first thing you need to understand is to allow your co founders and employees to have sense of belonging and giving them responsibilities and have trust in them.
You cannot be master of everything and cannot do everything hence you need to give responsibilities and have trust so building team which is the main ingredient in success of startups needs to be done with caution in selecting people but being too cautious and doubting their commitment will be problematic and will ensure that co founders start doubting their own existence in supporting your vision and dream
Wanting to know who are my competitors this information is good to have but first understand the importance of this information in the context of actual scenarios.
You have just started to build one mobile app, which is going to create platform where in fashion designers can list their products, and people who want to buy designer dress can buy.
This company instead of building data base and getting more designers starts to worry about who are my competitors what sales are they doing, what is the threat from them to my startup. These questions are irrelevant when you are setting up as you are not even operational and considering existing companies as your competitor does not give any sense for your thinking rationale.
Focusing too much on competition for a startup when its launching does not make any sense and spending time and energy and being too cautious ensures you loose focus and the whole process goes for toss.
What’s the market size for my product or service, how much market share can I capture in first 4 quarters, what will be my strategy to capture customers, with what percentage of market share will my company become break even operational. These jargon questions are good when you are 10-year-old company and planning to launch new division and these questions can be answered.
But with context of startup these questions are just to irrelevant lets look at it from practicality purpose these questions solve. IF market is 10billion dollars then even 0.01% of market share is good enough to be profitable and make money. So you will see founders saying my product has good 10 billion market share all I need is to capture 0.01% and its good enough for me.
These questions are theoretically good for discussion or debate in corporate parties but in reality they have no meaning to you, as your target of reaching that 0.01% itself is big target to reach.