Your camelia should flower - just leave it alone ie : don't prune it .
Make sure that the soil is damp , but not water logged .
As recommended , you need ericaceous soil and a tonic of blood , fish and bone and to keep rain from dropping on it in bright sunshine to avoid scorch marks .
They prefer rainwater , but mine have been okay with tap water .
I let my tap water rest for a few days if I can .
One thing , I found with an old camelia - it was covered in an unsightly "soot".
It was caused by an overhanging tree dripping water on it .
I hard pruned the tree to let some light in and hard pruned it . It is recovered and is covered in gorgeous white blooms .
I got a bucket of water and washed it the soot off with Epsom salts .
I have many camelias in my garden .
Some are unbelievably high -well over eight feet and flower in abundance . I prune them straight after flowering .
I have some in pots and they aren't doing that well .
I need to plant them out or perhaps repot them .