They're not huge problems at all, when people say slow metabolism(who told you this by the way?) it means you burn a few hundred less calories a day, the difference between eating a mars bar and not.
If you wanna increase your metabolism you can increase the amount of muscle you have(not an amazing option for girls) or do regular exercise, the key being regular, here its not about calorie burning as such, its about conditioning your body to burn more fat at rest at become more efficient at fat burning, thereby increasing your metabolic rate at rest. You can also gear your cardio towards higher intensity interval training, where more fat calories are burned after exercise, and which further increases your resting metabolic rate and your percentage of calories burned from fat during exercise and rest.
Other than that, SMALL, regular meals will also help solve the problem, and if you plan on doing more than 1 type of exercise a day, for example if you did some weights then went for a run, try and split them up during the day, so one in the morning and one in the evening, rather than doing them together, as this way your metabolism gets a "boost" twice a day rather than just once.