Use a flashlight (torch) to light up your subject. The strobe will usually over power the flashlight. This ends up being a circus act trying to hold the camera steady in one hand and holding a flashlight in the other. To make life easier the flash should support TTL metering. You can also opt to shoot in the day and use light modifiers which can be homemade at no or little cost (perhaps some tape and clips).
My usual technique is mounting the camera on a tripod or some stable surface (books, log, rock, table, ...), manually focus, then take the shot. A remote shutter release makes life easier. If needed, I'll use a continuous light source (work light, flashlight, overhead lights) to compose and focus. Since I shoot in manual exposure and focus, I will focus and compose in Auto mode using live view, then, switch to manual mode for the shot. Using a tripod ensures that my focus doesn't change.
As an example, the following picture is a setup for fashion shoot of a rattlesnake at night. I used a work light so I could manually focus (used live view for critical focusing on the eyes), compose, and make sure I wasn't in striking range of the snake. The work light was kept on all the time as the strobe overpowered it. You can see the baby snake (oh no! the baby shark song just came to mind) coiled up in the corner of the window sill.
If you want to continue doing macro shooting (lots of fun), get a tripod. Save up enough to get a decent tripod (I prefer a ball-head for the tripod to camera mounting interface). The $30 cheapo tripods will quickly disappoint, frustrate, and break.