Game with my own sprites, what should I do?

I have a decision to make and I am not sure what is easier. Either

A: I use MV template sprites and then go over thier sprite sheet with my own version of sprites, uploading the file with the same name to replace all said sprites

OR

B: Draw them all first and make the game later

Thoughts?

I'm really having a problem with using template sprites but drawing decent sprites is really challenging!

draw a bunch of important sprites as placeholders, figure out the correct dimensions and animation sequences, make the game, and then update the sprites.
you *can* change the way the sprites are loaded.... it's all just a bunch of numbers specifying coordinates.
the sprites are just representations of the game objects made visible to the player...... they'd be irrelevant to have if the game outright doesn't work.

A is the better option. I don't know how many sprites we're talking about, but it's very possible if you go with option B, you'll keep on making sprites, but never actually make the game.