It sure would be nice if all our questions could be answered in a couple of paragraphs, unfortunately they cant. There is a enormous amount of information on this site, you need to spend some time reading as much as you can here. There seems to be a lot of support in starting with a small CNC and then building a larger machine with what you have learned. Personally, I could not do that but it does make a lot of practical sense. I think most also agree crankorgan's plans are a great starting point. You do not always need servo's to go fast, what ever fast is
Best to you.