Let's pretend I ranted about the "I don't believe in labels" bit for a couple paragraphs, and just get to your problem.
Yes, I have advice.
Be VERY clear about what you want, and what you want to do. Work on drafting your ad, and have it checked by at least one other person. (I'll do it if'n you want.) It should read something like this.
Male, 25, always been straight but interested in seeing what it's like with a guy. Looking for a man aged 20-35 to show me the fun and joy of man-on-man action. Interested in mutual j/o and oral to start with. Initial public meeting a must. Safe play a definite must.
Some points.
1. Yes, I just (sorta) gave you grief about the label thing, but calling yourself straight instead of "bi-curious" or some other term will immediately double the number of responses you get.
2. Be somewhat open about age and looks. Don't insist on a 21-22 year old, supermodel-looking bodybuilder with a 10-inch dick. Those guys don't need craigslist to get laid.
3. Be clear about what activities you'd like to try. That way, if they're not into any of them (or they specifically want something else), they can skip your post. And the ones that do answer will know what you're expecting.
4. Screen through your responses. Feel free to ignore anybody who says things like "I'll give you the fucking you deserve." You're looking for somebody who will make this fun AND hot for you.
5. Initial public meet-up is essential. Do not go straight to his house with your pants around your ankles. Meet him at a coffee shop or something. Chat with him awhile about what you'd like out of the encounter, and let him know about any concerns you might have. And ask what HE's expecting out of the encounter as well. Do NOT go straight from the public meet-up to have sex. Thank him for his time, go home, think it over, and then decide.
6. Safe play - absolute must. Condoms, lubes, always. If you've never used them, go buy some now and start practicing.
Lex