1. Measure the length and width of the board.
No matter what shape your PCB design is, the length and width must take the max values. You should type the max values into the PCB width and length columns when place the small batches PCB order.
2. About Silkscreen
silkscreen line width (min: 6mil)
silkscreen text height (min: 32mil)
3. About Via
Blind via and buried via are not within our capability for the moment. In other words, only through via will be accepted.