My10, you generally can't just substitute rice flour for a.p. flour when baking because the gluten is what holds a baked good together, so to speak.
I have substituted GF all purpose flour when making gravy or breading chicken and that is ok. The texture is a bit different but not terribly so.
The King Arthur Site
has lots of GF baking recipes. They also sell mixes but you can often get GF Baking Mix or AP Flour in grocery stores these days. Those are not a direct substitute for normal AP flour for baking, but if you use a GF baking recipe, they save you from having to buy a ton of different flours and ingredients to mix to use in place of the flour.