Cucumber up poles question

So i am growing marketmore for the first time and have three plants growing up three poles.

I have been tying them to the poles and have had some cucumbers but just a few questions please.

There are loads of side shoots - do i need to snip off some of these?

There are loads of flowers - do i need to stop some of these becoming cucumbers?

Finally - the ones grown seem to be short and thick - is this the norm?!

Thank you - so you would cut out the side shoots if there where no fruits but even if there where flowers?

I reckon there is maybe 20-30 (of either fruits or flowers) on each plant (Maybe more) - i just didnt know if too many they may stop them growing large

I have a length of prison wire along one side of my greenhouse, my cucumbers fix themselves firmly along this.  Apart from removing yellowing or dead leaves I sort of leave them to see to themselves.  This year I only grew two plants and so far I have had 20 cucumbers, I think there will be about 3 more flowers to fruit... I water lots and feed regularly with seaweed feed and tomato feed as they are in growbags, cut in half and stood on end.  I did try poles one year and found the plants did not grip well up the poles.  I am very happy with the firm wire that the tendrils twist around.