Solo Sorcerer is great fun. In many situations it is actually easier than with a group, as you don't have to protect anyone but yourself.
I chose the usual equp: Robe of Vecna, Staff of Magi, Boomerang Dagger and later Firetooth (2 attacks/round, as opposed to slings 1 attack), Cloak of Displacment/Cloak of Mirroring/Cloak of Non-Detection (switch as neccessary), Boots of Speed, Ring of Gaxx, Ring of Wizardry, Amulet of Power, Belt of Inertial Barrier, Pale Green Ioun Stone (get the patch to allow mages to use these at Baldurdash, or if you have ToB you can use anyways).
For spell picks:
Level 1: Magic Missle, Chromatic Orb, Charm Person, Lartoch's Minor Drain, Protection from Evil or Identify
Level 2: Mirror Image, Detect Invisibility, Knock (must have for soloing), Melf's Acid Arrow, Web. You don't need Vocalize, as you can get the Amulet of Power very quickly.
Level 3: Skull Trap (big damage, 1D6 x Level), Melf's Minute Meteors (this is a big help early on, five attacks per round), Haste (not for you, for your summoned creatures), Remove Magic
Level 4: Fireshield Red (great offensive/defensive spell + %50 resist Fire), Greater Malison, Stoneskin (absolute must have), Spider Spawn (also a great help early on)
Level 5: Animate Dead (Skeletal Warriors at level 15), Lower Resist, Spell Immunity, Sunfire
Level 6: Death, Chain Lightning (or Distinigrate), Pierce Magic
Level 7: Mordenkainen's Sword (best summoning spell, as it is virtually immune to all physical damage and confusion/domination/stun), Finger of Death, Project Image
Level 8: Abi Dalzim's Horrid Wilting (can damage almost anything, even magic resistant creatures), Pierce Shield, Spell Trigger
Level 9: Timestop, Chain Contingency, Meteor Swarm
Breach is totally unneccessary for a Solo Sorcerer, as you will not be engaging in Melee after you level up a bit and your summoned creatures are mainly there to keep the enemy busy while you attack with your spells.
Don't bother with any spells that you can cast from a wand, like Fireball, Cloudkill, or Lightning. You can sell and re-buy them to recharge.
The only sequencing spell you need to learn is Spell Trigger. The other two are not all that useful, as you can only cast low level spells with them, and you can cast them off of scrolls.
Same with contingency, you can cast that off of scrolls.
Don't bother with True Sight either, you only need to dispel Invisibility to target something with spells; or just use Abi Dalzim's in their general area.
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"This place will be your tomb."