Something Old, Something New. Something meaningful, What to do?

I know what has been, but I don't know what's coming.
I met my father and sister last week when I was in Denmark, they don't keep in touch with eachother after everything either, so we both met our father after two years together, my sister and I.
Anyways, I spent the night at her place, I hadn't seen her in 10 years, it was strange, she was beautiful, all night I just just sat there, watching her sleep, thinking that this was my smart, beautiful, long lost sister of 14, and that I had a whole new world to explore with her. I was thinking that I have two sisters at home in norway, my new family, she was a part of my old one, but I was never to let her become my old one, she would always be the present one. She gave me this incredible strenght by just existing to me. I love her.
She made me urge even more inte my passion of making a change in my lifetime, doing something meaningful, the only problem is that I don't know where to start or what to do.