are you growing them in a greenhouse? They love lots of sun and will need lots of watering as the plants grow big and strong.
Sunny windowsill is also good otherwise. Stake with sturdy bamboo canes to support them. They do their own winding round though. I don't know which kind you have, but we have found the "burpless" very good. cucumbers a lot smaller than commercial ones naturally, but lovely. Little and good!

Big pot, feed every one to two weeks, water every day. Give support to grow up, best in a greenhouse. Pick fruit when ready and plant will produce more.