For my start up idea, I would choose one of following fields

As for my first business start-up project, my three possible initial ideas are smartphone accessory production, furniture making, and clothing production.
Phones are one of the most essential elements of our life and now it is almost impossible to live without them in the modern world. The majority of people are tending to take care of their phones’ overall condition and need different kinds of accessories and many other instruments making them in demand. The challenges of this choice can be competitors as this field of business is widespread.
Furniture is our daily life's demand regardless of whether they are properties for the long term. Also in the production of them, there might be troubles in terms of getting quality wood and other raw materials. Setting up a workforce also demands skilled masters be hired.
The huge number of competitors also influences the creation process of clothing brands. Before that, I also need to think about investors and building.

For my start up idea, I would choose one of following fields:

1. 
   Meal delivery service
   
2. 
   Travel agency
   
3. 
   Social media influencing