Am thinking of starting a financial literacy training business... but who would be my primary customers APART from employers?

Non Profit community groups who need to get training for lower income folks so thay can learn to use a bank and balance their budgets.

Your primary customers are always going to be the people that need financial literacy training.  Your English is hard to understand.  Who else could they be?  You can go directly to them via advertising and/or rely on word of mouth recommendations.  Your problem with going direct is that these are not going to be people who can afford to pay you.  Better to work for a business, charity, school, university or bank so that someone who actually has money in the bank to pay you.