Once you know your frame spacing (the distance between the rear dropouts where the rear wheel goes), you can choose any wheel that has that same dimension and 700c, and “QR”.
Its probably 126mm. So you can likely order any wheelset that says “126mm 700c QR wheelset”
they're mostly going to be Freehub (cassette) hubs these days. If you have indexed shifters (clicky), you have to order a cassette with the same number of cogs (speeds).
If you have friction shifters and a 126mm wheelset then you can order an 8 speed cassette and chain.
It is possible to use a 130mm QR 700c wheelset on a 126mm frame (with a little bending) This will allow you to use a 10 speed cassette (with matching chain).