Correct me if this is not what you want and in:
1. the main reason you want to invest is to preserve capital, but you do not
have any idea about what to use with the money so far.
2. Your investment horizon is at least 5 years, or it needs to be in money
market mutual funds.
3.You have a moderate risk tolerance.
4. Your allocation other than your human capital is all cash equivalent now.
Given these there are some suggestions:
1.List some goals you need to do, such as buying a house, save for
retirement, save for education, save for emergency, save for a new car, save
for your kids.
2. save 3-6 months money as emergency funds.
3. Check whether you have enough coverage for insurance. If you net worth is
high enough, make sure you have liability coverage enough and may consider
add umbrella.
If you do not have any life insurance (the one offered by your employer is
not enough) but you have dependents such as kids, you may consider purchase
life insurance with some of your money.
4. In general, investment would be easier if goal oriented.
5. Maybe take the traditional approach of 60% in stock and 40% in bond.
Invest long term in a balanced bond would be fine for you in preserving your
capital and realized some gains based on the risks you take. And also
sometimes we use "Core-satellite" approach by combing a index fund with a
high risk small cap fund.
Hope this helps. Regarding the actual selection of your investment vehicles,
that's a different task.