Graphic design is not the problem. The style it is. I recommend you first try to see what style you want to fit on your web, then a designer like me can sketch on a well defined grid a proper design. Organize all the info, spaces, and make it balanced. But you first need to find what style your company should have. A designer also can recommend you many things: trends, examples or can guide you on certain styles options that can fit, but those are hypothesis. The true numbers will come later, based on evidence.