Unless the animal is an adult, or at least a sub-adult, it can´t be sexed. Judging by the picture it is imposible to say...
Anyway, before thinking about getting more animals, you should really make sure you can handle the one you already have. You obviously need to learn a great deal about housing and specific care, so give yourself time to read as much as you can.
Unless you can provide excelent care, it really is inmoral to take an animal from the wild.