Hi @Yasamin B,
Welcome to the community!!
Depending upon the business and goal, you can go with search/display/video campaigns where you will find different bidding options including CPC, CPI, CPM, CPV.
Cost of each click/view/impressions varies on the business you are promoting, competition, keywords/placements and a lot more signals during real time auction.
I would recommend to go through the guide to AdWords
Archit, AdWords Rising Star, Community Profile
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