If you mean "stacking" the switches, you should just be able to connect the two switches via your fastest available ports. No need for VLAN configuration if you haven't changed them from the defaults, since all the ports are usually configured on the the same VLAN.
You should not need to setup any sort aggregation or anything of the like, unless you wish to replicate all data from all the ports onto the other switch (then at that point, why have a switch?). That is, unless you intend to have an IDS set up on one of the ports.
STP could be turned off, since you only have the two switches since you won't be running into any loops with just the two. But, it's not *that* much overhead to run it for only the two. I'd keep it on just for the fact that you may forget it's turned off if you add any more switches.