Eventually, you will need capital to become an Investor. However, that does not mean that you need to wait to start embarking on your career. As you begin to save money you can also takes steps to understand investing. For example, if you want to be a stock market investor, you can watch you tube videos on investing and there are free platforms that allow you to build a portfolio of stocks with fake play money and test out strategies. So that way you can start to learn about the world your investing in. You can also now buy fractional shares of real companies. For example, Apple is 165 a share, but you can buy 20 dollars worth of Apple and the same with other stocks.
If you want to invest in real estate, watch some videos and do some research on what its like to be a landlord. I own 5 investment properties and people ask me all the time if they should get into it? That depends on whether or not you like managing a property and all the things that entails. For example, tenants will call with clogged up toilets, hot water not working etc... Some landlords don't like to get those calls. I understand its part of the business and don't mind as I have access to good repair men in my area. Something else that people don't know about real estate is that 7 out of 10 millionaires in the US became millionaires from real estate.
Back to the money and capital portion of this. You need to make sacrifices to be able to save money. When I graduated college I was 15k in debt and had an old beat up vehicle. I started working 2 jobs and lived in my parents basement for free rent. Within 4 1/2 years, I paid off the 15k debt, bought 2 condos and then a brand new car. It takes a little time, but with hard work and perseverance it can definitely be done.
I agree with the previous post. A strong financial backing is what your investee's are looking for. If you are also able to demonstrate a specific skill set or knowledge, the investing aspect may also be aligned with equity or other partnership deals, if interested.