You cannot use always the same style of calligraphy to sign or to write other things on your paintings. Sometime, you have to use xingshu, sometime xingkai, sometime caoshu. But if you want to have a good calligraphy, even to write few words, you need to study calligraphy and begin by the beginning. I don’t think that you may only «copy» a model of the calligraphy of your name and do a calligraphy that looks well if you have not an internal feeling and experience of calligraphy. Another advantage : if you study calligraphy, your painting will become better. Chinese calligraphy and painting have the same root : 書畫同源 !