Each GFCI circuit must have a dedicated neutral wire. The device monitors the flow of electricity back through the netural wire to know when to trip. Using 14-3 would not provided a dedicated neutral wire for each GFCI. You would have to run two 14-2 wires to provide two GFCI circuits.
Yes a 14-3 circuit has a 15 amp capacity but you must hook up the black wire to one GFCI and the red wire to the other GFCI with the neutral or white going to both a GFCI circuits they can also protect up to 8 standard outlets per GFCI
Two GFCI's cannot share the same neutral while on different circuits as this would cause the to malfunction. A 14-3 circuit would use two circuits for the same neutral wire(white).
Yes, but there is no need for more than one of them. The GFCI should be the first plug after the panel, and it will then protect all plugs further down the line.
I take to tape role,cutting player,first three wire to Light holders,two current supply,one wire neutral to direct the light to switch connection,are ready to use the two lights.