Ask HN: How to follow up on promising investment leads?

Background info: I was a finalist in my college's business plan competition. Tonight the winners and losers (us) were announced. During the night's events though I got a ton of great feedback and praise. Several local prominent investors expressed a ton of interest in meeting with us further.

Question: I was looking for some good resources for what the best way to "stay in touch" with interested investors is. Should I send an email right away? What if we're not quite ready to take on outside investment?

Any help is greatly appreciated. Thanks