Welcome to the boards!
For sorcerors/sorceresses I find it best to work from a theme. This could be something like an element (fire sorceress, ice, sonic, etc), a seductress/manipulator (Charm person, suggestion, dominate, etc), a master of travel (expeditious retreat, levitate, fly, teleport, plane shift, etc), etc.
Once you have figured out what theme you want, if any, magic item selection is almost half done already.
You are going to want some basics like a weapon (magic or mundane), defensive items like Bracers of Armour, Ring of Protection, etc, and some way of healing yourself--your best bet would be a couple Potions of Cure Moderate Wounds. This will increase your chances of survival, and gives you an emergency way of healing your cleric if he/she falls in combat.
Next, I'd focus on ways of furthering your theme. Maybe some wands of fireball, or rings of mind shielding if you are the persuasive/manipulator type, or a Cape of the Montebank if you like flashy travel.
If your DM will allow it, I'd try to customize your items. I don't mean in terms of game effects, I mean in terms of appearance or ways in which they work. Fire or swirling gas motifs might be a nice touch for some elemental types, or objects made all out of crystal or wood, etc. Something that adds a little more dinstinctiveness to your character. Or, if you are playing a sneaky type, maybe the opposite is in order--have all your magic items appear to be nondescript mundane items and dress in subdued colours and patterns.
You have the advantage of working your magic items around your concept rather than a hodge-podge of uncovered/stolen/looted items gained over the course of an adventuring career. Take advantage of it and have fun with it!
It's always nice to see new members--have fun playing and hopefully we'll see you around some more!
If no one's mentioned it yet, there are some neat things on the boards you should take a look at. First, check out the Story Hour forum. It's full of accounts of other peoples' campaigns. Piractecat's and Wulf's are a must. Be forewarned, though. It is very addictive--once you starting reading one, it all snowballs from there. Just ask Horatio!
The Art forum is neat--maybe ask Kip the Bold for a drawing of your character!
The In Character forum has online games people are currently playing. I'm in two games--it really is a fun experience.
Have fun!
Acmite