What do i have to consider when i build my beef barn?

what do i have to consider when i build my beef barn.I don't know who to go to or where to start. I'm thinking of getting allot of cattle. Not just 50 or 100 but in the 300 to 500 range and maybe even more.Is that to much cattle , the average or just to little. I need to know where to start, i have no idea what they need with the exception of food. Could you please list all the things i will need to keep beef cattle. If i need separate spaces for calves and cows. And how many bulls do i need if i want 3 different types of cattle and only want purebred. If you can also how much would all these things cost and how much would the barn itself cost and stalls, the workers who build it cost and everything that is involved with it. Please give a total amount at the end. So, i need to know all the things that i need to keep them, how much they and the barn costs and some info on where to start and who to go to. What is the name of the type of barn i need(i will keep them in the winter so please take that into consideration when giving me the price) Where can i go to design it on the web. How much space do i need for them(in acres) Please take very single thing into consideration. And how much will it cost a year to keep it running,please keep that separate from the total cost. And what is the average price per pound on beef cattle, for bulls and cows.thanks so much