Golf 4 1.6 reving high when starting

Good day All,

Please can any one assist with perhaps answers to my issue with my car, Have Golf 4 1.6 SR,

OK,

What I have done thus far,

Change the thermo switch, Radiator thermo three pin plug,

Still she is reluctant to start and when she does she gives me very hi-revs,

A few days ago she started but white smoke came out bebeath the bonnet.

Dont know what to do?

Please help,

Miller

cidatcecil@gmail.com