Looking out for candid advises, i intend to apply for a visa to the united states, someone might say why? the reasons are below.

- I want to acquire technical skill in motor electronics such as VW,BENZ AND BMW.
- I Intend to establish a motor electronics company in nigeria after acquiring this skills, thereby making more people enjoy their choice of ride instead of just going for cars that can be fixed by road side mechanics.

Candid advise is needed from people who have applied for visa in this category, please note that it is a technical skill and not a regular university education,

questions that require answers are:

- do i need TOEFL or IELTS?
- will i require financial support from home since i have family there.

I have a passport, where do i start from? and what will i need.

Thanks for your candid and enlightening responses.