Is a tapered cut for me?

I have been wearing my natural hair for at least 3 years now and it seems like my hair has stopped growing and has thinned noticeably. I find that keep getting split ends and although i have been trimming my own hair i wonder if i have caused my damage by doing improper trimming. I have been considering a hair cut to start over with my hair but i don't know what fits my fat and round face or covers my large forehead.  Any suggestions?