I used copper 6 gauge stranded wire. You can pick that up at any home improvement store. Conduit is a combination of 3/4 inch electrical metallic tubing (EMT) and 3/4 inch flexible metal conduit (FMC). Those are also at most home improvement stores as well. I purchased all my products at Menards, which is like a Home Depot in the upper midwest of the United States. Menards.com sells online too.
Yes - but check the National Electric Code (if in the US, or similar for your country if outside the US). You also need to maintain enough free space inside the conduit or derate the circuit to a lower amperage. Check with an electrician in your area for the best response.
