Have you taken a look at this guide? Plenty of useful information.
The Wild Shape you are describing sounds awfully like the Shape shift variant from PHB2. If it is, you don't need to know anything about what to turn into as you get some very specific abilities outlined in that option. It dramatically changes any advice we can give, check in with your DM. For starters, it negates everything Reshy said!
Even with that, Druid is a very strong class and you really don't need to worry about anything except having decent Wisdom and Constitution. Even if you take lemons as feats you'll still do well.
It would also help if we knew what general sorts of characters the other players are going for, Druid can fill plenty of roles. Knowing what will be needed will impact what feats you might take.
The OP didn't say it was Shapeshift, so please give answers that pertain to what they ask.
Druid is a very powerful class, honestly nothing in Wildshape or Alternate Form says you lose your innate casting ability, in fact:
"The creature retains any spellcasting ability it had in its original form, although it must be able to speak intelligibly to cast spells with verbal components and it must have humanlike hands to cast spells with somatic components."
You could turn into a bat and give yourself a Pearl of Common Speech (600gp) and you immediately know and can speak that regardless of what form you are in. So that covers Verbal Components, furthermore while Expensive you have an item in Savage Species called 'Gloves of Man' (40k) which grant you hands for somatic components. So congrats, you can now cast regardless of what form you assume.
If you don't have a lot of money for those gloves, consider Casting Aspect of the Wolf on yourself to make yourself the animal type, then cast an Empowered/Maximized Awaken spell on yourself. Your int changes based on how you roll, but you gain the Magical Beast Subtype permanently along with the benefits of that type (Darkvision, Low-Light Vision, immunity to Animal/Humanoid targeted spells) and qualify for Fangshield Substitution regardless of your initial race or type which at level 5 grants you the ability to have fully-functional hands regardless of your assumed form.
If that's too complex consider picking up this feat from Savage Species:
SURROGATE SPELLCASTING [MONSTROUS]You use substitute verbal and somatic components when casting spells.
Prerequisite: Wis 13, nonhumanoid or nonhumanlike form.
Benefit: You complete the verbal and somatic components of spells by substituting vocalizations and gestures appropriate to your shape. You must still have suitable appendages and vocal organs. For example, a giant eagle could substitute screeches and waves of its talons for the normal verbal and somatic components of a spell. You can use any material component or focus that you can hold. This feat does not permit the use of magic items by a creature whose form could not ordinarily use them, and you do not gain the ability to speak if you cannot already.
+1 Planar Shepherd you can get some nice outsider, elemental and magical beast forms (you even get to use templates that turn things into magical beasts)
Good luck getting it approved though, ol' PS has a reputation. Here's what I would do: offer to give up the planar bubble ability, b/c that's the really broken part.
Planar Shepard is only broken when you use it on a Plane which has a weird time-effect. Which is the Far Realm and the Realm of Dreams. If you pick a more sane place, say Baator or Celestia; you get a good pile of forms and a not-cheesy bubble area. Also worth noting that sorcerers/wizards can already bubble those mentioned planes without a prestige class so it's pretty moot.
