i am growing cucumbers for the first time. What i have done is put tall canes in arund them and have tied them in as they grow up the canes. Seems to be working for me because the vegetables/fruit are doing fine.

The simplest structure is a tripod, three canes around the plant, tied at the top. It's strong, gives adequate height for the plants and you can tie in three main shoots, one on each cane. Otherwise, just grow them up strings in the greenhouse if they are not outdoor types.