^Excellent advice!
@kimura, you could just copy what they did ("stock heavy index funds, press the 'easy' button and forget about it") and be fine.
To explain more fully:
1. The choosing of adequate investments is the easy part.
2. What to get? Index funds with a large % of stocks are as effective as anything else, can be bought cheaply, and require no maintenance. Within that category, the next most important thing is low fees. You can find the fees by reading the disclosure statements or other descriptions from the company. Anything under 0.15%/year is reasonably low. The rest is details, though advice on the details is readily available here when you're ready. Vanguard is probably the safest company to buy these from and Fidelity can be good too.
3. Why does this work?
a. Index funds give a very good combination of safety and return compared to picking individual stocks, yet they require far less knowledge and work.
b. The fact that they're measurably a little bit better than individual stocks for most people is a bonus, but the key aspect is time savings.
c. Stock has a very strong, relatively consistent high performance over long time periods. If you plan to live another 30 years or more, you basically can't beat it.
d. For now, knowing you will be an investor, the downs in the market favor you as much as the ups do. If you're buying stock, a crash means that stocks are on sale.
e. That's all you need to know for the next 10 years. After that, you can adjust details to shift from saving mode to retirement mode.
Get your savings in order by paring down your expenses to the important ones, where you and your wife truly agree on what's important. Savings will occur and then you can invest as above. Wealth will follow.