For splitting duty, plan on owning a handful of tools. A 6lb maul, a "megamaul", a sledge and a couple wedges, and possibly a smaller hatchet for kindling duty. And since you're a tall guy, make sure you've got a splitting block that gets the wood up to an appropriate height such that the maul impacts the wood on a downward stroke, not a down-and-back angle that, if it misses/glances/blows thru the wood will put the maul straight into your foot or shin.
The first two implements are, to my mind, essential. The remainder are nice and helpful, and you'll likely buy them eventually, but you could survive without them for a time.
1. The 6lb maul is a good all-around tool. The 36" handle allows for some speed. Pictured in the attached image.
2. A 15lb mega maul, such as the one sold by Iron & Oak (the splitter people) uses mass to make up for speed, though it is deadly when some speed is added. When splitting by hand, this is my primary tool. It is also nice for kindling or for breaking larger split logs into smaller ones before they go in the stove or fireplace - I can drop it on a small split log in the garage, maybe 18" of swing, and pop kindling apart on the floor. Also pictured in the attached image.
3. An 8lb+ sledge is useful for pounding wedges or pounding on the backside of your 6lb maul when it gets stuck.
4. A couple different metal wedges can be helpful for nasty, knotty stuff.
5. A small hatchet for kindling is nice, too. Fiskars makes a fine one, a mini-splitter of sorts, which is slightly larger than their hatchet and has a much better profile to the head for splitting versus cutting. I really like this tool for kindling and for camping.
