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Look for some Eagle basics training videos on Youtube and put together a simple circuit that you are familiar with. In this example I used an Astable Multivibrator often referred to as a "dual LED flasher".
The final mirrored circuit board looks like this. I tried to place the components in positions that reflect there position on the schematic to make it easier to understand.
I edited the components making the pads larger and the drill holes tiny (see below). The hole size will be determined later depending on what size drill bit you use. I am using Eagle 9.6.2 and most of the tutorials on editing components are for older versions but the principles remain the same.
To change the trace width click the Change tool (looks like a wrench) and find Width in the submenu. Choose a value. Select the correct layer and click on the traces accordingly.
In the example above the wires are 60 mil wide. 40mil = 1mm. You will find a trace width that works for your board and router bit diameter. For this example everything is spread out so that I could use a 1mm bit. The example in the lower left below shows what happens if the traces are too close to the pads.
Editing components in Eagle
STEP 1
From the control panel find the library containing the component you want to edit.
Click on the triangle next to the .lbr file to expand.
Left click on the Device in the first column and select 'Open in Library"
STEP 2
Under the Library menu choose Manage Packages . .
Scroll down to the footprint you are interested in. Male sure you are in the Footprint tab.
STEP 3
To change the pad size choose the Change symbol (wrench) and choose Diameter in the submenu. Choose a value. I used 76 which is just over 3mm.
Change the layer to Pads and click on the middle of the pads to change the diameter.
Change the Drill to something small, 13.77 and change the layer to Drills. Change the drill hole size.
When you 'Save' the entire Library is saved. If you 'Save As' you can rename the library to make it easier to find. Remember which component footprints you edited. All the other footprints will remain unchanged.
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