you've angered the system itself with your actions and will most likely be outnumbered (don't believe me, see the French revolution an how every other absolutist country nearby wanted it to be over by yesterday at the time).
you have very little time to train an effective military force by medieval standards(and that's taking in account that normally peasants had nearly no training, even throughbecause you'd be better of exploiting that in the enemy forces), and your situation as a single city once part of the king's domains means you can't depend on a victory through sheer numbers, and you. You might have to use a good portion of the money to pay mercenaries to fight for you or at least bulk up and strengthen your forces while convincing them that trampling you, stealing your gold and handing over the region back to the old nobles instead isn't a better business (remember, Mercenaries fight for money, and depending on their morality, money will be important to ensure they'llthey remain reliable and loyal to you).
trading might be affected since you're now most likely marked as rebels by the majority of the big figures (and thetheir respective regions) nearby.
you still need the peasants to believe your revolution will be better for them than the old system while proving you're still just as capable of offering the same benefits the older system did, such as protection.
if religion is an important part of theireveryone's lives, especially in case of the peasants, you'll need every nearby priest on your side to prevent revolts from thegroups of peasants from rising against your revolution, and if religion doesn't side with you, trying to use force onpersuade them through force will likely make the situation even worse.
if invasions are a thing, there's a chance that you will need to be capable of dealing with them and the king's forces.
there's a risk that the king and his nobles will send assassins to get rid of the revolution leaders in the meantime. Murdering the leader is a fairly common strategy.
All of these affect the economy, because depending on how the peasants, the church, the nobility and the traders see and treat you, you'll need more or less money to make it all work, with a worst case scenario where not even all of the money might not be enough to solve the situation in a favorable way for the rebels.
Also, it might have been obvious already but your social experiments has to wait. 6 months is not a lot of time to go from an averagea large trading city with nearby peasants to a military nation with some properly established defenses and troops, and depending on how similar your medieval world is to our own, you're already behing schedule in terms of what needs to be prepared. Your city is in the place of France during its revolution, meaning everyone wants your revolt trampled, your rebels publicly hanged and their associates dead.