I have an 8 port switch (netgear fs108) that has 6 pcs connected to it, 1 wireles router, and one plotter. Problem=no more ports for additional computers to get on the network. For the time being, i can plug more computers into the the router to gain internet access, but this does not allow me to access the network(pcs and plotter). I also have an 8 port hub, and wanted to know if I can connect the hub to a port on the switch to create more ports on the network? Any suggestions would be great.. thanks in advance

Yes, you can attach the hub. You could get another switch and add that. It would all work and self configure at layer 2. That is the magic of IEEE 802 bridged networks.
However if you add a router, you’ve added routing at layer 3 and that will require configuration of subnets.
yes, look on the hub for an MDX port or an uplink port, its usually standalone or the last 1, or you may have to use a crossover cable
Yes. All you need to do is connect an ethernet cable to a port on your current hub, and then connect the other end to a port on a new hub. All ports on the new hub now have network/internet access.
Yes, but a word of caution…if you have multiple devices connecting through that hub you will run into a problem called "collisions" where one or more devices are trying to communicate across the hub at the same time. This could present itself as slowness because the information will have to retransmit everytime it collides.