Entrepreneur is basically someone who has a product or service that they want to sell and become a business owner. It takes a lot of time and work to become a successful entrepreneur. You must be willing take certain risks and face many challenges to become successful.
Obviously the first thing to become an entrepreneur is you need a product or service that you want to sell. There are three important things you need to keep in mind in order for your business to be successful:
1) It has to make you money
2) You have to be good at what you are doing
3) Most important one of all, you have to love what you are doing
Without those three, you truly won't be successful. After you figure out what you want to do, you have to come up with personal goals: What are you expecting from this? What are you trying to accomplish? After that, you need to create some sort of plan of how you are going to get there called a "Business Plan". Try researching it online to see what's in a business plan and what it takes to make it successful. Once you have one and it's fully completed, you obviously need to the money to start build your company. Unless you have a lot of money, you'll need to find someone and that's what your business plan is for. After you find the money you need (called "capital"), you can go build your business.
All of this is easier said than done. It takes a lot of hard work and time to become one, but when you finally become successful, it's all worth it. If you're really serious about becoming an entrepreneur, I suggest you start researching. Just search up entrepreneur, business plans, capital, marketing plan, and anything that you find but don't understand. A good book you can read that helped me is called "Good to Great" by Jim Collins. Another website I use for resource is a site called BizTools:
http://www.biztools.com/ . They have a lot of information and tools I can use when I build my plans.
During the process, a lot of people are not going to believe in you so you have to stay strong. If you strongly believe that your idea will work, then believe in yourself. I wish you the best of luck with everything. =)