The basic concepts that will save you a 15 bucks book:
- you invest so that your money works for you. Even if you cannot drop your job, you can still live a bit better with extra income.
- Investing is sacrificing something today to get something tomorrow. This is just a definition. You save x today because you want 2x tomorrow or in year or whenever.
- The first step to invest is saving part of your income. No savings, no future.
- If you have credits unpaid (other than mortgages or other asset backed credits), you pay those first because they charge you a lot.
And from here we could start speaking on how are you going to save regularly, if it is going to be 10% of your income, or 5% or 50%, how are you going to learn about investing, etc...
I've actually done it once, in order to boost my investment, but I never proceeded to do it again, rather than invest my salary, I decided that it's safer to reinvest any money I earn through my main investment, without involving any external funds.