IUD/birth control questions

I'm 23 years old and I have finally decided to get on bc. The option most appealing to me is an IUD, the ones without hormones. I've never given birth, so does that make a difference?

 

I'm also considering hormonal birth control though, to see if it helps clear up my acne and possibly increase my breast size. I'm just terrified of the negative side effects. Any suggestions/words of advice?