Where can I find the simple, basic 8 pin female socket?
In core parts (the right hand window). The connectors section near the bottom of core has header connectors (male and female) of varying sizes. You drag the icon in to your sketch, then click on the part and in the Inspector window (bottom right) you can select the size of the header, male / female and other parameters. If you are looking for an IC socket then drag the generic IC (the first icon in the ICs section in core parts) in to your sketch and do as above. Inspector will let you change the number of pins and the spacing in with the pull down menus. If you need some other type of socket type socket in to the search bar on the top of core parts and all the sockets in core (and probably a lot of other things) will come up.
Thank you much!