Hi There... Let me try to help answer some questions for you.
Sublimation we suggest mainly for doing hard surface items, such as ceramic tiles, metal, MDF boards and FRP Plastics. The ink, when heated turns to a gas and the pores in the blank item open up - sucking the ink into it and then as the item cools down, the pores close back up allowing the ink to become part of the item itself. Does that make sense? The main catch to these blank items is that they are polyester coated and that is the coating that allows this process to occur.
If you use sublimation ink and apply it to a fabric - that fabric must be 100% poly and white in color to get the best & brightest image result out of it. If you use a 60/40 for instance, you may get a more vintage type look over the bright image when using 100% poly.
If you're wanting to do darker colors, pastel colors and stick with more 100% cotton or 50/50 blends then you should stick with a regular ink jet printer (like the WF1100) and use the regular Epson inks and buy some transfer paper. Now transfer paper doesn't become part of the garment like sublimation does, but you will get a nice, bright image and you will be able to use the 50/50 blends or 100% cotton.
A couple suggestions on paper are the JetPro SoftStretch for light garments. This paper has a nice, soft feel and will stretch with almost any type material.
A paper for darks, would be the 3G Jet Opaque - this paper works great on 100% cotton and will have a little more ply-ability to it over some of the other more stiff opaque papers.
Hope this helped a little and please email me should you have any other questions!