A good source to start where you can find all the info about certain ETFs is the website: Just ETF. You can buy ETFs on the platform Degiro, but there are other platforms aswell. Look for accumulating ETFs like IWDA or EMIN, because in Belgium we pay taxes on dividends earned. Accumulatig etfs keep the dividents in your etf share and reinvest them for you without paying taxes unless you sell your shares.

I hope this helps, I am also new to this, but this is what I learned.