The real money is in creating your own digital product not promoting it. Ignore the idiots who will have you spending the next 5 years selling diet pills.
The issue is to try to stay away from an ebook in the IM niche. The recipe for a successful info product:
1) Find a pressing problem in a money market - Health, Wealth, Relationships
2) Create some Solutions
3) Add fucking value! As an example, let's say you have some programming skills. Write a digital product on "7 Ways Small Businesses Can Improve Their Productivity Using These Simple PHP Scripts"
or whatever.....
Just recently, Amazon announced that they are selling more digital products than physical products.
The trick with digital products is you have a) add value b) build up a customer list c) sell to them over and over again....
Build a BUYING AUDIENCE first; create products FOR THAT AUDIENCE second....
Then you won't just be "making money" you will be building wealth....
PS
If you do try to promote someone else's product at least opt them in to your own list so you can start developing a relationship with them. Then you will be building assets for your self and not just chasing the one-off unique-visitor-buy day in and day out...
PLUS, your conversions will be higher....