- Your bank's platform will cost an arm and a leg; Interactive Brokers or Degiro are both available in Switzerland and you will save so much on fees (especially if you only buy and hold ETFs of which Degiro offers many with 0% fees) that it's the equivalent of faster returns on your money.

- There are many "getting started" guides available, I found Mister Money Mustache the most straightforward to my liking, but you're golden as long as you understand a couple of basics: 1. investing a high% of your income is more important than chasing returns (you seem to be there already), 2. don't trade, just buy the whole market (you mentioned Vanguard, they offer a "total market" ETF), 3. look for the lowest fees as long as you hold title to your shares (IB and Degiro do this ; eToro does not so if they sink, you're SOL), 4. don't time the market, just buy now and sit on it as it grows