Before you throw your money into anything pay of any debt, 3 -6 month emegency fund and, do your research. Dont throw it all into one thing spread your risk.
I suggest reading Andrew Hallam Millionaire Teacher or Expat investor mainly because he focuses on establishing low cost index ETF portfolio and focusing on Target % for each assest and just rebalance once or twice a year by adding new money/or not if dont have and rebalancing your assests back to the set targets %. Selling your in profit assets to buy your lagging (cheap) assets. In example 70% Stock/Equity ETF like Vangaurd VT, 20% Gov Bond ETF, 10% Gold ETF or you could even add in Crypto ..60%,20%,10%,10%
Your Choice. If you are Europe based then you have access to Vanguard ETFs domiclied in Ireland but availabe on various bourses. The Book will explain why best to invest in what ETFs and domicle etc.you could start with one ETF and add other assets to build your portfolio over the years
If you are in it for long term dont worry about market peaks and falls, worry more about broker fees (flat fee or 0% fee, plus low platform fees), ETF management fees (i.e 0.3%, Dividend WHT (although I avoid ETFs with Dividends) just stay focused on adding money and rebalancing year on year. In fact I am happy when an asset price crashes as I buy more.. I take it that it is "on sale"
Have a search for Andrew Hallam he has a Blog, his book will prob take only a few days to read its about €10, Kindle version by the end you will wish they taught it at school he makes investing so easy to understand. Also have a search for Couch Potato investor and the Permanent Portolio.
As others have mentioned read up first and DIY invest dont pay others to do it for you
Good luck on your investment journey