Hi Harry,
Well, you seem to be on the right track already by asking this question!
There are a lot of good posts here and on other forums. I suggest you consume all that information, engage with some posts, and ask questions if things aren't clear.
The obvious steps, which I'm sure you're aware of, involve trying to arrange internships and speaking to people working in the firms you're interested in. If you don't have any personal contacts, consider following some individuals on LinkedIn and engage with their posts. Leave comments, ask questions, and after some time, you could try to connect and message them directly.
Read a lot of books - there are so many great ones about investing. I will be posting a series of posts containing reading lists soon. If you need some ideas on where to start, keep an eye out for those. Who knows, I might even write a book on Asset Management!
Lastly, try to work out what you enjoy and then be honest about whether that fits with the jobs you're considering. For instance, I enjoy history, figuring out how things work, engineering, science, Art, and taking risks. I don't like to work too hard, have a short attention span, and don't suffer fools. Notice I didn't mention stock markets, economics, or investing, but all these interests align with those areas and mean I mostly enjoy my job. It's hindsight speaking here, but I know that these wouldn't fit with a high-pressure, long-hour investment banking role, for example. So while it might be hard at this point in your career to be so clear-cut, you could start by making a list of what you like and don't like, and then try to map that to the jobs you're considering.
The CFA qualification is valuable - essential, even. Most investment managers will let you take time from work to do the course; some might even help you pay for it.
Whatever you do, make sure to remain curious. Always want to know more.
Actually I have to hard disagree on this one. Unless you are intending to go into an equity analyst role or aim for a stock picking PM type role then CFA is irrelevant, people get so excited about it and its not easy but really its not needed at all for many career paths.
In any case you will need to get the job first, then your firm will probably let you take it and you will get study time off etc. But depending on the career you want to pursue there maybe more relevant courses like PRM/CQF etc, the majority of macro managers I know never went anywhere near a CFA qualification. I would only recommend it if perhaps your university and school experience is very art's based.