You don't need to stack unless you want to have a single management interface or if you want to do "Link Aggregation" (LAG) where you are using ports on multiple switches in the LAG.  Stacking also provides some level of protection when used with cross-switch LAGs.  However, if you are not doing anything complex and likely you are not planning to mess around with the configuration all the time - configure it once and once its working you don't touch it - then I don't think a single management interface will be of any advantage (especially when you only have a few switches anyway).

I say if you want to use the switch in its simplest incarnation then don't bother to stack it.  Just uplink them (connect them) together in serial.  If you are planning to disable spanning-tree then make sure you DO NOT accidentally create a loop anywhere in your network (your PCs must also not be forwarding because they can also create loops - for example if you connect to PCs with multiple NICs and they forward between the NICs).

If your setup is simple and you are careful not to introduce loops then just operate them as individual node (don't stack) is simplest in my opinion.

Cuong.