hmmm...
1st thing you need to know is that you must NOT be dissencouridged by the fct that the 1 girl said no to you. ( By the way... why did she say no? could you please elaborate)
Otherwise in the overall picture what i think that you should do is become realy friendly with both of them and then flirt with both of them... Now generally you should be able to TELL if a girl is interested in you by the time u get really friednly with her, and the girl that you get better "vibes" "signals" "connection" "click" wateva u want to call it, then you should go for that one.
One thing that you need to make sure of though... and thats to make sure that you let the girl that "rejected" you know that all you want is her friendship, so she musnt think that you got other motives.... Now by doing this she will let her guard down and be able to be more open and comfortable with you. Then slowly you need to start going to lunch with her (as friends) and slowly slowly make her fall for you.... and if she doesnt, then move on, its HER loss, NOT YOURS, there are PLENTY other girls out there for the picking.
And with this other girl that u say that u USE to be friendly with... what happened? are u not friendly with her anymore? whats your friendship like with her at this point?
If you ARE still friendly with her then give her a call and make arrangements with her and do the same as you did with the 1st girl, just that u dont have to mention that u JUST wnana be friends, because thats a given in the friendship that u already have.
And another good idea is to meet OTHER girls (their friends) at the same time... So when u make an arrangement with one of them, then tell them to bring a friend or 2 along along, and u do the same... and then u can eventually get their friends numbers (cellpgone numbers) and widen your selection of women.
Well... thats what i would suggest you do about your current situation...
Goodluck
Laterz...