Valuation of a high tech start-up and DCF/MODEL And CAPM model

HI to all.I wanted to value a High-tech start-up of which I have the cash flows of the comming 6 years I am not a VC just a Post-grad student, so I decided to use the Discounted Cash Flow Method. To do so, I calculated the Discount rate. For a High-tech start- up the discount rate = Rate of equity (which can be determined by the Capital Asset Pricing Model). So I calculated my Discount rate, used it in the DCF model And found an aproximation of the Value of the High-tech Firm.

But I didn't took in consideration that the company sells their products globally. This fact has an impact on its beta Factor! and consequantly on the discount rate and finally on the Value of the firm!

One option is to use the International CAPM model, but 'my' company is going to sell globaly, so how do I know the impact of that to the Discount rate?

any help would be very appreciated

Thanks