Russell
Welcome to the Forum
Your lines sound perfect albeit the floater may be your most used line for smallwaters which tend to be, on avr, from 7ft - 18ft deep at max. Hence a floating line and long leader can still reach most of the deeper places.
If you are not confident in your casting capabilities with multiple flies then stick with one. There are many arguments for using one to two flies max on a smallwater where the fish see alot of flies whizzing around their heads..........
A nice rig to use is something like a leader of 6ft of 8lb line, 5ft of 6lb line and a final 4ft of 5lb line. To this you can tie a single fly such as a gold head damsel or an Apps Bloodworm.
Cast this out, let if sink for a wee while and then very slowly tweak it back with the odd slow pull to get up a little bit in the water column.
If you are comfortable casting two flies then have at least 5ft between them on smaller stillwaters............unless you are fishing under the bung but that is a WHOLE different story and not one to ask about on here unless you have a very thick skin.
Or a sinking line, short leader and a booby........still 'thick skin' territory but not as bad as bung territory
Ben