Let's start with the new name:
You would need to start a new account. You would start over at zero posts and pencil 1, but you could get a new name by doing that. You may need a second email address, but I am not sure.
Let's do the picture:
If you have a photobucket account you go to the image page you want (click on the image to open it). The image needs to be the size you want before you use it ... Photobucket has an edit / resize feature you can use. Click and copy the direct link option and paste it into "Link to off site avatar" area at the bottom of your profile page on FW.
You can also use a facebook photo by right clicking on the photo. One of the options when you right click a photo is "Copy image location." Click that and paste it into the "Link to off site avatar" area at the bottom of your profile page on FW.
I randomly clicked an image from facebook and used the "Copy image location" option and posted it here just to make sure it works.