If you want to do a full set you need to build up to it in stages. After all how do you know that you would remember your hour and a half of materila, and present it in a way that is entertaining? Ask your local club for a hot spot; it is half the length of a full spot. You won't be paid money but you will gain valuable skills. Offer to do short sets for charities etc. Folk singers don't just perform at folk clubs; they also work alongside poets, artists and acoustic musicians. They perform in care homes, arts centres and libraries. Explore the different venues in your area. Learn to play an instrument so you can add variety to your set. If a guitar isn't your instrument try something else. Good luck!