For the social icons, you can use this if in the header:
#header .aux-item ul.social-icons li a {
color: blue;
}
1) You want to change the actual icon? Install and activate the child theme, inside the child theme functions.php
file we have a function for this that is commented out. You need to uncomment that and add your own icon codes to. Once you have the child theme activated, let me know and I can talk you through it.
2) Not in the top specifically for the header, unless you work with a developer. In general, yes you can change the order of the icons, see this thread and see Kyle’s latest respnose: http://www.swiftideas.com/forums/topic/reorder-social-buttons/