If you are new to Bitcoin investment then it is important to have basic knowledge. If you do not understand what Bitcoin is, what is the function of Bitcoin, how does it work etc. If you do not have knowledge in all these things then I would say that Bitcoin investment is not for you. .
After gaining some knowledge about Bitcoin then you can gain knowledge about wallets. Because if you do not know how to invest in Bitcoin then I think it is a mistake to know about wallets first.
The next step is to make sure you have source of income before going into bitcoin investment and know you can also invest bitcoin as little as waht you can afford. Do not think the little you are investing is too small, if you let that to settle in your mind you won't be able to invest bitcoin. If you are consistent with the little you can afford it can go a long way for you in the future but if you wait to invest big amount you may not even begin the journey to invest.