Additionally, I would recommend building a freelancing website as a side business (making websites for others), especially at the beginning while you are just starting to develop your passive income portfolio. This is a good way to consistently make some fast cash too (just two gigs per month will make you an extra $1000). Some freelancing advice on how I used to do it can be found here:

I also want to continue bringing more people over to the other side of work - a side where they have more options in life. A lot of people have potential and talent but they’re too afraid to strike out on their own or try something new. I want to give those people hope and also the tools to get started. I want them to take my courses and understand how they have the power to change their lives if they can first work up the guts to make a big move.
It is a good module to go through however if you have the time because it gives you further insight into the tactics and strategies online marketers have used. Sometimes knowing what not to do is just as important as knowing what you should do. It can save you a lot of time down the road so you don’t fall victim to snake oil salesmen peddling yesterday’s junk (and there are many out there). 

With drop shipping, you’re effectively partnering with a manufacturer or wholesaler to sell their products. This way, you don’t pay upfront costs to buy inventory, aren’t sitting on unsold items taking up expensive warehouse space, and don’t have to deal with shipping the products yourself. You simply create your site, fill it with drop shippable products, and drive in customers, with almost everything else done for you.