What should I do first in Coach a Fighter?
Finish the tutorial, redeem Update1! and Release!, sign any starter fighter, run a full block of ten trainings, clear sparring, then take a Bronze league match.
First hour
Codes, your first signing, the training rhythm, and your first win — in order.
Updated

Coach a Fighter is not a fighting game. The developer says it plainly: "You do not control the punches—you watch the fighter in INTENSE matches and train their strengths and weaknesses."
You are a manager. Your decisions are which stats to train, which equipment to buy, which league to enter and which fights to bet on. If you came expecting to throw punches, that expectation is the thing to drop first — everything else about the game makes sense once you do.
Finish the tutorial so the full interface unlocks, then open the Codes panel and redeem both working codes. They are worth 50,000 Cash, 20 Real Rerolls and 6 Legend Rerolls between them.
Type them exactly — both are case-sensitive and both end in an exclamation mark. A missing "!" is the number one cause of a valid code being rejected.

The signing screen is headed "Select a fighter or reroll again" and gives you a choice of cards plus Free, Real and Legend Reroll buttons.
Your first card genuinely does not matter much. Training is worth more than rarity at this stage, and you will be running training blocks on whatever you take. Save the Legend Rerolls — six is your entire starting Legend budget and an untrained Legend loses to a trained Real.
Walk your fighter to a station, pick a repeat count, start training. After ten sessions the game stops you with a popup: "After 10 Trainings, your fighter must do a match to train again."
This is the metronome of the whole game. Ten sessions, one fight, repeat. It also means Overall ticks up by exactly +1 per full block, since Overall rises +1 every 10 trainings.

Official bouts are gated behind sparring. If you try to enter a league match too early the game blocks you and tells you to put your fighter in a sparring match first.
Once sparring is done, open Leagues and take a Bronze bout. Bronze is open from the start, pays $2,500, and awards 1 Real Reroll Point and 1 Legend Reroll Point. Bouts run three rounds — the ring HUD shows a round counter reading 1 of 3.
A Free Rewards panel pays out on playtime milestones at 15 minutes, 20 minutes, 1 hour and 2 hours, with an option to double the reward. It is easy to miss and costs nothing to claim.
There is also a free second fighter slot from the tutorial — a popup notes you can now hold multiple fighters and buy a third slot from the shop. Take the free one; leagues gate on roster averages, so a bench matters sooner than new players expect.

FAQ
Finish the tutorial, redeem Update1! and Release!, sign any starter fighter, run a full block of ten trainings, clear sparring, then take a Bronze league match.
No. You get six from codes and that is your whole early budget. An untrained Legend loses to a trained Real, and you need gym slots and Cash to finish any card you pull.