Dont invest in anything except (almost) guaranteed returns for now(1 year CDs are starting to pay 2-3%) .
An emergency fund of 2+ years expenses in cash.
Slowly increase your standard of living over a long period of time (or not at all). I operate from a budget, not from cash in the bank. Religiously stick to the budget (this is hard) but dont beat yourself up if you go over. Quicken does a reasonably decent job of setting up a budget and allows you to keep spending in various "accounts" under control.
The standard safe withdrawl rate is 3%. Im planning for a more conservative 1.5% approach. This means you can take out up to 3% of your total funds each year and never run out. At 8m and 1.5% safe withdrawl you still need to work.
The strategy requires you to have a reasonably significant percent in the market. While the market could keep going up, I think you can wait a few years for the inevitable recession, but eventually you will have to get it into index funds.
I make a good income from my business and it is easy to get sloppy when I have too much cash. Last year at a fundraiser I got drunk and dropped 30K. Im not mad about the donation, but Im mad about the way I did it while being out of control.
Also this account is an example of a wasted $100k :)