If you believe it is time to discuss furthering your relationship then feel free to be open about wanting to make it a steady thing. After a few weeks, say you would like it if the two of you could see one another regularly. This will give you a good indication of the worth or risk of continuing before you get in too deep and get your hopes up too high. Avoid using intimidating conversation starters such as, "we need to talk" or "can I ask you something". You want to approach the situation as casually as possible. A good alternative would be "I have really enjoyed my time with you and I wanted to see if our feelings are mutual." This doesn't mean he wants anything to end. This just means he might not be as ready for a solid relationship as you are. But, that doesn't necessarily mean it won't happen. Everyone has a different dating history and his could result in him just needing to take time in gaining trust. Your reaction could be the ultimatum if he does want to continue or if he decides maybe it's time to end it. If he says that he is not ready for a relationship yet but still wants to see you, you shouldn't feel rejected and instead reply with "That is great and I would really like to keep getting to know you as well!" Your confidence will be reassuring and help him relax and get comfortable to continue with your date. The next level is where you start to spend more time together and really begin to understand each other in greater detail. Remember, this is still the beginning and you don't want to make it more than what it really is. The most important thing in relationships is to continue having fun. Nothing needs to be really serious until it is time. But, until then, continue to make things fun, new and exciting. Do all those intriguing and flirtatious things you did when you first starting dating, don't stop just because you are in the next level of your relationship. Keep things exciting with new ideas or weekly events. Plan a day of the week to be reserved specifically for an exciting date, no matter what it is.

Summary:
Be open and honest. Remain calm and collected if he is not there yet. If he is ready for the next level, don't overdo it! Just have fun.