Doing a guide for a game like Campgrounds is hard because the players do not have the same starting point. Your initial resources for each level depend on your results from previous levels. Another challenge is that Campgrounds is very much about how you execute - and you had better be fast!
But we created a Playthrough for levels 18-60 for both Eco and Money route in Challenge mode.
We hope it will be helpful and that you enjoy the game!