start by educating yourself more about what bitcoin is, how it works and pretty much the basics to have an idea what you are buying.
and then move on to learning which wallet is best for you to use and what is the safest way to secure that wallet which you ended up choosing.
this link has most of the information you need to know:
https://bitcoin.org/en/getting-startedafter reading through the above pages, come back here and ask any questions that you may have. like some part that you did not understand or made you confused.
What he said^^
Also an important step for me was to read posts on this forum everyday, understanding the numerous doubts from other members and their respective answers. Don't forget that a key part of investing is to keep urself up to date on crypto news, so i suggest you to find some cryptocurrencies news websites that should visit frequently. I also follow some specific twitter accounts that are news related.