I think with term of trading, you should start from one particular coin, probably from Bitcoin or Ethereum, if you will attend to hold, it is better to start with 3 to 5 different, but top coins as well.
I think that it is best to start with 1K, then spend them on the scheme 50/25/25, and first it is desirable to choose the top tokens that would minimize the risks. The income will be small, but with minimal risks.