MooMoo, I too, was once like you...almost exactly in your shoes. I remember rushing like hell 3 days before I entered BMT to deliver a computer program to a client. I made it, nearly killed me and my buddies tho....and the client was stuck for 3 months without patches or upgrades....

You have drive and passion - that is very, very good and I would say most of the population doesn't have this. That is why Singapore is not reknown for its entrepreneurs. However, drive and passion is half the battle won. It also depends on what you do with that passion. NS will definetely change your perspective. It will help you establish contacts, learn people skills, getting out of a sticky situation. In that way it is beneficial to you as a budding entrepreneur. Besides technical skills, people skills are very, very important especially in high product customization industries like mine where there is very high consumer participation.
Having business skills is very important too. I recommend you take the time and save money so that you can go for an MBA somewhere down the line. It really helped me to strategize and think hard about the business. Also helps to deal with customers and negotiate with them. I would say that without a business degree, I would not be able to manage the business as well or close as many sales. The paper qualification was a bonus but for me it was the actual business skills that are really worth something.