Relays have two parts, the coil part and the switch part.
The coil part usually has a coil resistance, a voltage to turn on, and a current to turn on spec. That's what's needed to activate the coil. Don't go too high on current/voltage or you'll overheat/destroy the coil. If the voltage you supply is too low, it will fail to activate - don't get one that's not what you want.
The contact part is rated just like any other switch. Don't exceed any of those parameters either. Also make sure you check AC/DC specs as well as motor specs, they're special cases that could cause more wear/damage to the contacts than normal. Typically DC and motor specs are much more pessimistic.
So what you need is input coil 12V, 100mA or less (though a 555 probably can drive more, better to be safer), and contacts of 220VAC, 5A per contact/circuit or higher. Adding a bit more margin would be nice too. You can use a DPDT to switch both hot and neutral for more safety, if you want, just don't miswire. You could also use two DP contacts in parallel to provide more margin, too.