I think one needs to ask a staff member regarding changes to one's avatar, not sure...but you may have already done it.
As for recommended juices..Jacky has given you a link..but i'll tag @MrDJ as he'll help you with that.
I've been vaping about 6 weeks now myself, so like you i'm still very much a learner. Loads of help and advice can be had here..so don't be afraid to ask anything in the newbie's questions thread.