You are progressing quickly, for sure. Try using Etsy as a resource to establish your own pricing, but make sure you are comparing apples to apples. You need to find similar products with the same skill level you are at.
Resolene. Cut it 50/50 with water. Wrap a sponge with a piece of soft cotton cloth & soak that in water - squeeze out till just damp. Dip in the resolene and squeeze out again. Wipe on VERY lightly, in one direction. Wait an hour and do a second coat. Works for me, every time. The leather looks like leather and feels like leather. Sometimes I will put on three coats - still gives me a nice finish. I always using Fiebings pro oil dye.