Your plan is excellent...
My advice, is to take a runty stave from your first batch and season it quickly by sealing the ends and putting it in a hot car/garage/whatever. Rough it out as it is still drying and have a go at making a bow even if it's not fully seasoned.
You will learn soooo much in the first attempt and it will get you on the right path.
Start with say 66" - 70" long and about 1 1/2" wide.
Leave the underbark surface alone, this will become the back of your bow (furthest from the archer).
You can taper width and thickness or just width (but that still needs a lot of work to get the thickness even).
Go from about 1/2 thick in the middle to about 1/4" at the tips. Taper the width from 1 1/2 to about 1/2
This WONT make you a bow! But it will get you roughed out to something that flexes and wants to become a bow!
Don't fall into the trap of cutting out fancy handles and stuff, it can weaken the bow and is a waste of time early on. Leave the centre section 1 1/2" wide and thick as heck to start with tapering smoothly into the limb about 2 - 3" either side of the centre line.
You will need to make a tillering rig, this can be any thing from a notched stick to a block screwed to the wall with a pulley below it and a spring scale.
Have a look at my 'Bowyers Diary' (just google it) and website 'Delsbows' on my bowyers diary, I post everything I do from cutting a log to tillering. I also show my mistakes (as we all make 'em)
Get stuck in and have a go, sooner you start the sooner you'll learn, you can be reading about it when it's too dark to work
Del