How many different types of wallets are available in the market to secure my bitcoins, and which one is the best?

I have done a master's in mechanical engineering, and i have a good knowledge or understanding of the functioning of electric vehicles. I want to build my own startup company. For starting my idea, i have few queries:

1. How can I design a model to enter the fast expanding EV sector of today?
2. How can I use these techniques to make our brand unique and attract business?
3. Which of range, battery life, or technology most interests buyers?