When it comes to Mugen, google is your friend. A Google search sent me to the site below:
Spoiler, click to toggle visibiltyYou may register to the site if need be but you'll find it useful nonetheless.
Use Fighter Factory in order to rip said sprites and edit them further in Photoshop.
I hope this helps!
You can find a variety of readily available resources in the Mugen Classified section in the home screen of this website.
Don't be shy to ask for help in the Help section either.
Also, the "verification thing" is a spam filter due to your account being new.
Welcome to MFG thepapowski!