PvM Frozen Orb Rush Sorc
This build is really beginner-friendly, and it is one of the most effective and cheapest Frozen Orb Rush Sorc Builds in Classic Diablo II.
Helm: Iratha's Coil
Weapon: Spectral Shard
Shield: 3-Socket PDiamond Large Shield
Gloves: Iratha's Cuff
Boots: FHR 3x FR/LR/PR* or 2x FR/LR/PR* Boots OR Hotspur
Belt: Iratha's Cord
Left Ring: FCR 2x FR/LR/PR*
Right Ring: FCR 2x FR/LR/PR*
Amulet: Iratha's Collar
* Combination of any 2 or 3 Resists
45 Base Str, Base Dex, Base Energy, Rest Vita
Skills (Level 80)
20 Frozen Orb
20 Cold Mastery
1 Static Field
1 Frost Nova
1 Ice Blast
1 Glacial Spike
With this build, you won't have to Mana potting constantly because of Maxed Teleport. For those of you who don't already know, adding points to Teleport reduces the amount of Mana required for each Tele. (Maxed Tele = 5 Mana per Tele, and 24 Tele from added skills = 1 Mana per Tele.) Adding a point to Warmth is optional for Mana regeneration, but I recommend putting one into it so you'll be able to Tele indefinitely.
If you don't have someone to Chant you, please refer to Orphan's Guide to find the best places to level.
Get the Sorc to Level 20, and hit up Normal Cow games to Level 25-30. Once you acquire Frozen Orb, you can try Norm CSing to gain a few levels, or you can NM Cow with a group to Level 40-45. After this, play with a group through Hell, and get to CS; the rest of your leveling is done here.
It is a proven fact that there is no one Sorc that can effectively take on the entire game by itself, and you will need help when rushing, especially when it comes to Hell Act 2 and 3. So what about adding a second kill spell, you ask? You could do that, but from personal experience, it doesn't make the rushing any easier. If you are rushing someone, make sure you have access to another high-level character that can effectively kill Cold Immunes in Claw Viper Temple Level 2, Arcane Sanctuary, and Travincial - preferably, a PvM Barb.