[1.8] ¿ is yet someone doing a guide explainig how to set custom blocks ?

good days

there i came to step where i need to do blocks for mi mod, but like everybody i get frustrated for the way 1.8 work the render of the faces of blocks

i been scavenging the vanilla classes the models and the blockstates folder ican't realize how to se textures for a single unitexture block

someone has done  a good guide yet ?

where to find , gogle is no t clear .