For a 1st, 2nd, or even 3rd bow I'd encourage use of pyramid or near-pyramid design.
Ideal tiller for pyramid is "arc of a circle" and, for me, it's much easier to see that tiller than the elliptical tiller you'd want for limbs that were constant width for significant distance.
Also, because arc of circle is what you're after with pyramid, use of Tillering Gizmo is ideal. That simple lil tool virtually guarantees no hinges and maximizes odds of decent tiller. Google "tillering gizmo" if unfamiliar with this tool.
https://www.youtube.com/watch?v=KqvwUqn-EFQRe the handle/fades riser block . . . I would encourage use of 2" fades, or more, especially for first bows. I would glue on a riser that yields total (limb board + riser block) 1.25 - 1.5" thick/height handle . . . personal preference.
To avoid riser popping off, design fades in such a way that last 1/2" or so of fade is melded into the limb. Don't simply have entire fade sitting on top of your red oak. I'll try to find pic of what am trying to say.
BE SURE you have good mating glue surfaces between your limb board and riser board. Particularly if ya plan to use pva type glue such as Titebond.
Good luck!