Kyriakos, be sure to apply Johnsons paste wax to the cast iron to prevent further rust and make it easy for the wood to slide. Do not use automotive wax as these contain silicone which could effect finishing on your projects. No need to shell out big money for a fence; build some sleds that run in your miter slots. This way you get 100% accurate cuts. I highly recommend the Freud red saw blades for all circular and table saws; great value for your money. If you use a thin kerf blade (1/8") you are removing less material per pass which in effect gives you more cutting power. Make one sled for the left side of the blade; build another which uses both miter slots to guide it with 2x4"'s front and back and attach boards at 45° for quick and easy miter cuts.