Franco,
Chase has put together a VERY comprehensive article on texting girls recently:
How to Text Girls: 20 More Tips and Techniques. I suggest taking a look at that in full.
But to paraphrase that post, and based on my experiences, waiting more than a day or two is not recommended. If she seemed totally into you when yall met, you're probably better off asking her out sooner, probably within the next 24 hours. But if she seemed a little cautious and unsure, give her a little time to process you two meeting, but not too long such that she forgets about you altogether. No more than 2 days here.
Since you say you've waited 3 days to ask her out, you might be a tad behind. But you also say you've been talking a little between now and when yall met. Chase does cover extensively the different types of texters that exist out there, so check that out so you can improve in the future. Just be sure you're not trying to build too much rapport through texting. Then you'll have nothing to talk about when you finally get her out.
Now, I'm assuming you didn't already set up the 1st date on the night you met her and got her number. If you did, it makes things so much easier. If not, I would suggest texting her ASAP simply asking her something like "Well hey, what do you say we go grab a bite sometime soon. How's your schedule looking for the rest of this week?" If you already mentioned doing something with her the night yall met, just mention that and ask her if she want's to do that. Then ask her what her schedule is like.
Again, this is all covered VERY extensively in the article I linked to by Chase. He also gives more advice on what to do after you ask her about her schedule, along with the "Why's" behind his reasoning. For even further info/reading, if you haven't read it already, check out Chase's other post on texting,
How to Text a Girl.
Finally, don't be afraid to get it wrong at first. Remember, this girl is not the only girl in the world. You will begin to improve your skills and seducing girls will eventually seem very natural. Don't get caught up on just one girl. In the words of Chase, "
Can't Stop Thinking About Her: Here's Why you Need to Meet More Girls."
~ Cheers
