Well..........you might need to answer a few question first before you head down this road.
How much money do you have to spend?
What class do you want to pull in?
Are you married?
If so, does the wife have a REALLY good sense of humor?
I would NEVER use my work tractor for pulling. Even in stock classes, if you push things hard they break and it ain't cheap to fix.
I am presuming you are interested in diesel. Just to give you an idea of the cost of building a little bit of power to have on tap to play with, a friend and I made a few modifications to our trucks (2002 Dodge Ram 2500 4x4 Cummins) to bump the power up from the stock 245 hp and 505 ft./lbs. torque to around 380 hp and estimated 900 ft./lbs.
New 90 hp fuel injectors run around $800. I got mine used from a friend who races a Cummins diesel for about half that that were near new but not what he wanted.
The Edge EZ runs around $450 which will raise about 65 hp.
The BHAF air cleaner, Outterware Pre-filter, and heat shield was about another $150.
The Farm Boy Performance 5 inch straight pipe exhaust was about $350.
The A-pillar EGT, Boost Pressure, and Fuel Pressure gauges cost about $400
The AirDog 150 fuel lift pump/fuel de-aerator cost about $500
The Cummin eBrake (exhaust brake) cost about $700
The engine current makes too much power for the stock clutch to hold and will easily slip the clutch. A Southbend ConOFE clutch will run around $1100 give or take.
Tractor pulling parts are way more expensive than the stuff I put on my truck.
You might start looking around for some pulling tractors for sale. Folks are always getting out of tractor pulling do to various reasons but cost is a big one. You might find a good pulling tractor to get started with and avoid some of the learning curve with the mods and parts already installed on the tractor.
If you are married, you are gonna need a REALLY cool, and tractor pull oriented and hot wife too!
It is not difficult to tie up a LOT of money in this sport but it is fun though. I prefer to just watch and hold on to what is in my wallet.
Welcome to Tractor Forum by the way.