Always get piggies from shelters! Make sure you do a three week quarentine...make sure you handle the new guinea pigs last while in quarentine and make sure you intro right..is that what you mean by suggestions?
Always from a shelter or rescue or someone who is getting rid of them. Always quarantine (unless they are a pair then that won't be necessary. Always Introduce properly. Speak quietly and calmly around them, don't move to quick, let them get used to you...And thats about all I can think of right now.
Welcome! When you get your piggies and have quartined them and intorduce them, give them lots and lots of love! But probably on their first day at their new home they might want some time alone.