$2M is not an infinite sum, in pension terms. You have 40 years to fund and you're talking about helping your children a bit.
If it were me, I'd look at spreading it across a GIC ladder on the immediate term. You could buy four GICs with terms of 1, 2, 3, 4 years, all for $500K, and then study what you are going to do with the money. A year of study would not be too much. It sounds like you are boot-strapping your investment knowledge. Be patient with yourself.
Be cautious of money managers. You will end up buying investments that pay them the most commission. I would encourage you to take your time, study the options, and carefully consider how you are going to approach the future.
Most of all, remember this: You are not rich, but you have enough money to live comfortably as long as you don't mis-step too badly.