Wizards have a slight bonus in feats compared to most classes(Lunia). They get an extra feat at character creation and another bonus feat roughly every five levels. Since most of what you will be doing in a mission is casting spells, it makes sense to pick feats which enhance your spellcasting abilities. We would definitely recommend Mental Toughness as a starting feat to improve your spellpoint reserves. This would help you last longer between rest points and cast a little more often.

There is also metamagic feats to consider, such as Empower Spell, Extend Spell, and Heighten Spell in game(Lunia Gold). You toggle these feats on or off as desired any time you like. While on, they enhance most of the spells you cast, but those spells also cost more spellpoints. Note, though, that while your wizard has enough spellpoints "to get by," you will probably find that overuse of metamagic quickly drains your mana reserves. Thus you should probably use these feats primarily in large, key battles to give your spells a little extra oomph and not rely on them for extended periods.

The main exception to that rule would be Extend Spell, which is generally a pretty spellpoint efficient way of making your buffs like Mage Armor and Shield last much longer. The good news is, that because of your bonus feats, you have the opportunity to take a pretty wide variety of metamagic to choose from. You can, for example, have Empower Spell handy if you want to up your damage for a battle and have Heighten Spell available when you plan to use save-or-die magic, and also have Extend Spell on hand for your buffs and debuffs.