You need to build your experience, your confidence, and comfort with directing subjects. One way is to find a friend or two to practice shooting with and directing. If they are patient, you can test different lighting setups with them. You can supply them with some photos as a thank-you.
Another approach, to learn to work with models, is to hire a more experienced model to shoot with. They will want to be paid for their time, & may not expect photos, though offering a few is a nice gesture. There are a number of experienced models who are willing to do such shoots to also help newer photographers along. They can self-direct their posing, while also giving you their feedback about poses that work best. The money you spend is an investment in your future success.
Here on Mayhem, there is advice and support available here: 2nd LIST - MENTOR support for newbie photographers