The only valuable data you have provided is the maximum size of a 2D object. That's not enough to start with, you need a Z movement also. Not only that, but what sort of budget do you have? What are your expectations? Is it for hobby or for professional use? Does it have to pay it's costs, or it doesn't matter? Are there other important limitations we should know about? For example maximum weight and machine size (floor space), tools and machinery you have, material you want to use and so on.

Yes, the Internet is a minefield, but it is also a gold mine. There is plenty of information freely available to start out with, and I honestly think that the best would be if you could limit your requirements and define more clearly what you actually expect to do with the machine and how much it should cost as maximum. Personally I think for full time job and professional use it is better to buy a serious machine, but that costs of course a lot of money. At the same time, anything worth to have will cost more than people expect it from the start. The fact that you can do some, or maybe all the work on your own does not automatically mean it will be cheaper than buying a similar, ready made one.