also confused on the feed rate and depth of cut
feed rate is tool movement (following the shape) speed. The same, as axis movement speed. Presumably, the edge of the tool is cutting, that's why the name "feed" is. If You draw a line by pencil, the feed rate is speed of pencil nose in regards of paper.
Depth of cut is how deep the tool edge goes into material. If You draw the line on a paper, there is almost no depth of cut at all
want to learn how to run the machine by hand first
do You ride the bicycle? do You swim?