Vikman: listen carefully =D
1. 90% of the time, when a girl doesn't answer a phone/call back/text back, after you got her number IS because of the initial interaction, i wont go into the key points to hit, as thats a post in itself.
2. a GREAT technique is to text the girl the night of or day after with SOMETHING that will recall a moment of the interaction. For instance, i meet a club dancer this weekend, and we made fun of some girl trying to dance, we called her, ms mc hammer. so texted her "you should see me, im breaking it down like ms mc hammer right now, she inspired me, im going on american idol!!!" Its a call back to a fun time WE had together, she will instantly feel a sense of "hahah the305, is cool and funny" as it was funny as $**** when we were talking about it.
3. i suggest you do NOT go out on dates, NO NO NO - especially if you are just starting out. a date just involves expectations! and expectations lead to pressure, the LAST thing you want is pressure on a situation. Dont even THINK of asking her out, until you feel you "know" her enough to hang out with her. So.. add her on facebook.. have a few texts back and forth.. THEN have a casual meetup, its NOT a date, you dont get to know someone on "dates", you get to know someone by casual talk.. hangouts.. etc..
Follow those simple steps, and you will have tons of girls, some will be friends and some be more then friends, but FOCUS on getting girl friends, the one you DONT sleep with. Those will lead to MASSIVE amounts of women, that will be interested in YOU.