WACC

First of all, I would like to thank you for your great work. I have a question on WACC, actually how to use it in practice, please help and tell me if it is a right or wrong way I think. I have to make a forecast for a company and I don't know at which rate to discount it, because there are not statistic rates for Beta and Risk free rate and so on. Without this factors, I tried to calculate it based on Balance sheet. For instace, if a company has 6,000$ Equity and 4,000 12% debt, total 10,000$; At the end of year it received 1,000$ profit, from which 700$ was given as dividend. For WACC calculation purposes, I calculate cost of equity: (6,000/10,000*700)/6,000=0.07=7%. then Cost of Debt assuming 15% is Tax rate :Kd=i(1-Tax rate) /Po=4000*12%(1-0.15)/4000=0,102=10,2%. Assuming that Market value of equity and debt is the same, is it fair that WACC=equity/(equity+debt)*cost of capital+(debt/equity+debt)*cost of debt=6,000/(6,000+4,000)*7%+
4,000/10,000*10.2%= 4.2%+4.08%=8,28% and to discount future forcasted profit at this rate. Again, Thank you for your time.