Do I need to start the enginne 1 time a week?

[Dave48]

Unless you run the bike up to full working temperature you will do more harm than good due to build up of acidic condensates. Every litre of fuel burnt produces an equal amount of water vapour which unless the bike is run up to operating temp will contaminate the engine oil.
Better to remove battery unless you have an alarm/immobiliser fitted & bring indoors, occasionally trickle charging on an Optimate or similar-cold weather is the enemy of batteries.