My business idea will probably take the form of putting up a few websites, monetizing them with various sources of income (e.g. affiliate links etc.)
This always sounds like an easy way to make money, it isn't, there are loads of sites out there trying the same and loads of get-rich-quick companies telling you to do just this.
Your main focus is how can you get traffic to your site, your site has to offer something that people want to see/use. By traffic, anything under 5000 hits a day is total trivia if you want this to generate a sustainable income.
Even when you have a good idea for the site to attract punters, you then need to create the pathways for them to find you. This basically means you need to boost you google ranking, to do that you need loads of other sites linking TO your site - this is another mountain to climb. Loads of sites will link to you for a fee but beware that google knows about ranking booster sites and ignores them.
Be careful on the enterprise scheme, they promise 6 months jsa, 6 months housing benefit etc, get that in writing from the relevant departments - it has a bad habit of disappearing prematurely.