Hello guys first of all i want to point that i dont have any experience about eagle and i am trying to design a pcb. It will be a commercial product so it needs to be perfect. I have finished my schematic design. There is no problem about that however i have some troubles in board part as you can guess. Firstly net class specifications i made, width 12mil,drill 20mil and clearance 12mil and i got 730 errors about them from drc checking. So what are wrongs with these numbers. What are the things i should be worry about when i am arranging them. In which case i should create more than one net class why ? Also i want to make these holes in pcb. Because i just want to put 433 mhz rf module on it. So what should i put in the schematic to use them. These are not headers right ? Also i assumed that they are not just holes which you can make from board design or are they ? 
