I second MulledWine, - there is no magic formula for texting just the right thing at the right time that will make or break your romantics fortunes.
I would recommend pragmatism though, - not because it sounds like it's doomed or anything, just because a) dating is a bearpit, and b) because sadly, just because a man says that he likes you and wants to see you again, does not actually mean that he likes you and wants to see you again.
I don't want to sound like Eeyore, but some men will say literally anything if they think there might be sex at the end of it. He has already told you that he 'isn't keen to rush headlong into anything at the mo'. For that, read 'doesn't want a girlfriend, but might want a shag'.
He has already text you, - what was the outcome? It sounds like you are still waiting to fix a second date. If he doesn't text, then you get ONE text or call to prompt him. If that doesn't work, then DELETE HIS NUMBER. He isn't interested, and you then will appear desperate. Men don't really play hard to get, - if they are interested in a second date, they will usually attempt to secure it whilst still on the first date.
What this has shown you is that there is a world of men out there, all different, and that you are a bewitching creature and men want your number. Good work 