Trigger job/adjustment.
Lap the bolt with lapping compound and just working the snot out of it.
If the stock is not cheap plastic float it, bed it, shoot it and see what you can do with what you have before just dumping a lot of money into it.
You might well end up with a very nice shooting rifle on a poor boy budget. If not then the next steps in order for me would be a better stock and then a custom barrel including truing the action.
You can very easily spend a hell of a lot of money on one and not really see an appreciable improvement over just polishing up what you have to begin with. Of course you can't polish a turd and make it shine like a diamond either. If however you have a diamond in the rough you can do a lot with it on a budget.