I have some amount of money in my possession which am planning to use for business, but the only business i have passion for is transportation business. my major challenge with this business is how to manage it or get a reliable company to do that for me which will comply with any agreement we have. please if you know any RELIABLE company with vast experience in this business please kindly share.

Don't

Get a bus. Toyota Hiace or coaster. Dont paint it in the usual commercial colour. Install a tracker and speed limiting device then get a driver.

Invest in marketing and customers can hire the bus .
Rules: Dont allow your driver to solicit for business/ customers. The customers call you then you send ur driver . His job is just to drive.

Another option. Similar to the idea stated above but you can use a cheaper bus. You will target working class passangers and take them to work and back. Specific destination. Driver will not handle cash too.
I can help you implement and manage the process.

I'm also into transport business. Corporate cab service

i av bean analysing this axpect of buziness 4 a while now ,u can start ur own transportation campany , ( start small and graw big) if av the requare capital u re to make not lest than 150-250k monthly.