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Number or strokes is relative.
There is no way someone could say do 10 or 20 etc strokes . your stone is not barber hone which usually needs 2-5 strokes to refresh the edge.
Depends of early...

we usually use 325 then move forward max it 1k . i never went behind 1k.
Very rare you may need to go more if your finishing stone is escher or fine Japanese stone.
slurry stone you have is small...

lets hope this will work now

Most likely yes. i have never seen flat stone yet.

i am not sure what type slurry stone you have but you can use small dmt plate to make slurry if you need to do...