This does not solve your issue in anyway: what you lack is physical cash as it has become difficult to withdraw cash from the bank due to the recent CBN policies on the naira, thus even if you exchange all your naira for Bitcoins, you still do not have physical cash, but Bitcoins in your wallet.
Since you don't know how Bitcoin works, i'd advice you hodl your money in the bank until you understand what you are doing to avoid loss.
I'm not aware of what's currently happening in Nigeria. However, banks rejecting you access to your money is one of the biggest motivations I'd say to finding an alternative. At least, with Bitcoin they'd never be rejected their right to their money. Obviously, paying with Bitcoin, and using Bitcoin really does depend on your local situations. Although, cities tend to offer a decent amount of services, and goods for Bitcoin. So, if you live somewhere which Bitcoin is popular in you can probably get by. Potentially, renting or mortgages would be the only limiting factors.