If you do your own concrete pour, you will be renting the mixer I assume. I would not use quikcrete type pre mixed sacks. It doesn't finish as well as using a raw 3-2-1 mix of 3/4" gravel, sand, and cement (respectively). Do a simple calc to determine how much of each material you will need to achieve the volume of concrete you will need. Of course, have all your rebar or wire mesh in place with any 2x wood forms properly pre-installed with necessary slopes. Consider placing an empty 4" diameter length of drain pipe across (below) the entire width of the intended pour (in case you want to run any sort of future lines below your concrete from one side to the other, underground). Even if you never use this empty conduit, it's a cheap nice-to-have. You may thank yourself later.
If the overall pour is greater area than you think you can handle in a day, consider splitting the work into 2 parts. Do one half one day, next half the next day. Pour up to a piece of form you set at the mid point. The next day remove that piece of formwork and complete the second half of the pour.
Also, have a tool ready to create control joints at intervals to control any cracking that may occur down the road. Install the control joints while the concrete is freshly poured and still very wet. If it gets too dry, this will be much more difficult. To get a nice uniform finish, use a screed board, which can simply be a 2x4 of adequate length. Work it on end, back and forth as you pour the concrete to even it out. You will need to work somewhat quickly, but usually there's not too much of a rush. Having a helper is best. For example, one person can be mixing the concrete in the mixer and the other placing it. At a certain point, the wet concrete will begin to dry enough that you can begin to trowel the surface to achieve a finish. You can broom finish a bit later when the concrete is more dry in order to create a non-slip surface.
Probably tons of related Youtube videos.
Perhaps post some photos so folks here can make more informed suggestions.