So Tossers are also called Hucksters, Fastballers, Throwmeos, and Motherchuckers. And they are in all respects FIGHTERS with one step better HD than normal in your game. In all other respects they are Fighters.
EXCEPT
They are proficient with no conventional weapons. They are proficient exclusively in found, hurled weapons, which they can hurl their Strength-plus-Level in feet. This includes enemies. This includes fellow PCs.
When throwing an unattended object.....
Treat it as a 1d3 item and use the higher of your Strength or Dex bonus to determine a hit. If it isn't something you could conceivably shove with your same Strength score, like a wall or an obelisk, you can't throw it.
When throwing an enemy.......
You may attempt an unarmed attack roll plus your Strength bonus (if any) to grab an enemy on a hit. You can elect to keep the enemy grappled/held as per normal rules or you may throw them as part of the same action. At 1st level you may hurl any enemy with 1HD or less. At 2nd you may hurl any enemy 2HD or less, and so on, up to 9HD. Enemies of roughly humanoid/demihuman size and shape with more than 9HD may also be hurled as long as 1) their total HD is lower than your level and 2) they get a saving throw vs Paralyze/Petrify to land safely.
Enemies who take fall damage this way are treated to have fallen an additional 20'. An enemy making contact with a solid object take 1d8 damage plus your Strength bonus (and if the solid object is like spikes or a trap or on fire they may suffer other effects).
An enemy colliding with one or more enemies means you roll 1d10 damage plus your Strength bonus, and then the DM distributes the damage among the victims as she sees fit.
When throwing a Party Member.......
You may use the higher attack value between you and the thrown PC, and the higher damage between the two of you, and the PC gets a Death save to land safely. This effectively uses the thrown PC's turn in concert with yours so ask for consent and Throw Responsibly(tm). If the PC gets any bonus to a successful hit like Sneak Attack or a magic weapon effect it can go off thanks to your roll. This by definition moves the thrown PC. You cannot throw a PC with more HD than you.
Summing up the main rules of this class are:
No Weapons
Throw anything you can move normally through Strength
Throw any enemy or PC with HD equal to/less than yours
Throw high level enemies if they are basically people of a lower level than you who fail their save
Throwing distance is your Strength+Level in feet.
Tossers may wield no magic weapons unless they are specifically meant to be thrown, like Thor's hammer, and may only wear magic rings and gloves that improve their throwing power or accuracy. Also potions and uh....capes. Magic capes.
At level 9 they do not establish a kingdom or attract a bunch of acolytes but they become proficient in all weapons. They also become famous for throwing things, and can earn lots of money throwing things for people for fun and show, and signing autographs.