You need to provide more info. Starting SG, present SG, temp, date started, etc.
Why do you think you need to kill the yeast? Your first racking should be to a secondary fermenter to allow the wine to finish fermenting off the gross lees. After fermentation has completely stopped the yeasts will be pretty much dead. At this time you would stabilize and add clarifiers or leave to clear naturally.
The second rule of wine making is the 3 P's. Patience, patience, patience. Don't try to hurry your wine. Do each step based on hydrometer readings, not by the number of days that have passed between steps.
Good Luck with your wine there are many people on this forum who will be happy to help you, so keep asking questions and go to the tutorial section and read.