I'm sorry but I have no idea for the Quickbooks. As for your second question, You can find clients by posting your offered bookeeping work i facebook groups and for sure someone would be interested and message you. Happy new year anyways.
My best advice for you is to work first in an accounting firm for 2 to 3 years. This at the very least could give you a good experience and by that you could choose to stay in your company or find better options.