If you are using the mario i used in the tutoiral video look at this link, and it will show you how to remove the extra hair for mario
http://prntscr.com/71ncet
To get rid of the back ground you need to make a sprite sheet of all the sprites and then index the sheet to 256 color's and make the background be transparent, you need a program like photoshop Gimp or Paintshop , and for the extra parts like that find a different mario that does not have the hair sticking threw the hat.
Okay so you right click to move the model to center it in the screen and you CTRL + Right Click to move the model around and then you right click to move the model to the center of the screen. Also to remove the screen shots you open the brawlbox folder and go to the screen cap folder and delete them when ur done with them,. i don't know what you mean by unnecessary parts
You can get there sounds and effects on the same site, you just need to search from them and go threw all of the SFX section to find what ur looking for
Making 3D Character's With Brawlbox
Download Brawlbox
https://www.dropbox.com/s/awowmb3d66gjyvl/BrawlBox%20v0.71.zip
Download Pac Files(Motion Files)
http://www.mediafire.com/download/e5ui6mn8s575bu7/Pac_Files.rar
Download Character's
http://forums.kc-mm.com/Gallery/BrawlSearch.php
i will do my best to awnser any questions that you guy's have.
i hope this helps you make a 3D character
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