IMO, when starting out, your first priority HAS TO BE keeping them contained on the property... so a decent perimeter fence.
Second, you will need to have SOME means of containing them individually when they need work, or for sorting, loading in and out, etc. And you want to be able to do that safely... I'm a fan of the heavy 24' freestanding panels, and I wouldn't install a corral "in the ground" again. You can always sell them, if things don't work out for you... you can always change how you've got them arranged. You can always expand as your herd size grows. AND... if you know somebody that already has them, you can probably work out a rental arrangement... EVERYBODY doesn't have to own everything, for sure. You don't NEED to have alot of them, but you DO need to have enough to do what you need to do, when you need to do it. The same guy with the panels probably has a portable squeeze that he'd be willing to rent to you too, if you'll be needing that. But you can also get by with what I recently learned (here on CT) is called a Medina Hinge... go through this thread for more info on that...
Bud Box vs. Bud Flow Tub. You can do alot with just that, and it would be pretty cheap to do. Find a good used headgate maybe online, if you can't work something out for renting the equipment you need at first. If you have the Medina hinge and a headgate, you don't necessarily need a squeeze chute for most things.
If you don't have experience with cattle, you're going to need to GET that experience "on the fly". You can avoid alot of costly mistakes and investing in too much "overhead" that you can't justify, by asking questions of guys that have already been doing it awhile... they have already PAID for their education, and most of the time are willing to share what they've learned with you for free. CT is a great place to meet them and pick their brain.