What are your preferences, I'm new?

Thanks

10 is ok if you want to take some risks, 20 is probably above average, 30 only if you're indy, and anything above that is probably too much spies.

Thanks Xinhuan

high spal is good if you are grabber since it means it lowers chance getting op from your country.

Thanks too Marshal

It really depends on your play style, which server, etc.

I've always favored keeping 10% of my land producing spies at all times. If I'm playing indy, 10% of production is always set to spies. Any other strat, 10% (or thereabouts) of my land is indy complexes producing 100% spies.

Probably overkill, but I'm a big fan of information.