How to draw the pattern of 8-pin ic on pcb, and where is the first pin of ic?

No matter how many stitches, stitches and patches, a semi-circular arc is used to indicate the direction, which is equivalent to the real thing. When looking at an IC, there is generally a semicircular groove on the left, which corresponds to a semi-circular arc on the PCB. The 1 pin counts counterclockwise from the lower left corner.

See the figure below. This is an 8-pin IC, vertical, with a semi-circular arc on it. 1 pin is in the upper left corner.