Online Lottery Database Design

Question

I am trying to design a database for the known 6/49 lottery game. But I am confused about designing. First thing came up my mind is something like that:

Table Users:
ID | Name | Age | mail | username | password | balance | etc. |

Table Coupons :
ID | Date | Draw Date | Chose 1..6 | isWinner | owner username | earning | Cost |

Is that enough? Or I really want to hear new ideas. For example, after a drawing, I am going to enter results to the system. Then system has to check all the coupons which belong to relevant draw date.

However, wouldn't it be too much load if there are hundreds of thousands coupons of this particular draw date? What is the best desing for this system? Or wouldn't it be to much load when a user tries to list the coupons that s/he has played in his/her account page?

And I have to say that, I am very junior about database designing.