WT101, welcome to the forum and to reloading. I began the same odyssey almost a year ago. Man, what a ride! I wish someone would have slapped some sense into me years ago about reloading. There are a lot of great people on the forums that are willing to share what they know and have learned. I'm
still thanking them and borrowing ideas from them.
jibjab & Idano imparted good advice already. If you can, try to anticipate where you are headed with your reloading. If you already have a press that will help, as you know the dimensions/requirements. Decide where on your bench you want to mount the press. If you think you might be adding more presses in the future, take that into account too. If your press can be modified and you think that might be in the cards down the road, that should be taken into consideration.
My bench is a shelving unit I bought at COSTCO for $75. It is approximately 22in deep x 48in wide by 6ft tall.
The shelves are all adjustable. (It came with 5 shelves; I use 4 of them.) The top shelf, mounted at the very top has my 4ft fluorescent light hanging underneath it. I store my tumbler inside a 5gal. bucket overhead along with other items. That leaves me 2 shelves below for bullets, powder and everthing else a loader is wont to accumulate!
I beefed up the top where the press is mounted with ¾in. plywood on top of the original shelving material and skinned that out with ¼in tempered masonite. As for the height, that is totally up to you, the user. Whether you choose to sit or stand, I would take into consideration that when you are doing the actual loading, make sure you can visually check the powder charge in your cartridge before seating the bullet. One last thing, cuz this is getting kinda long: If you use a beam balance scale (as I do) affix a shelf near your eye level if you can. This makes reading the scale much easier. Good luck to you. Let us know how you make out.
Happy Thanksgiving! Oh, I almost forgot; if you buy bullets, powder, primers, etc at the gun show, take a small rolling cart to carry the stuff in. I use a luggage tote (the thing that was used before luggage had wheels) and mount a small basket on it. 1000 rounds of 230gr bullets weighs 34lbs give or take. Add any other stuff to that and you will be lugging. My luggage tote paid for itself in 20ft!