Your overwhelm motivated me to answer, though I am not a subject matter expert here.
Back when I was 20 years old, I had a really good job making really good pay for a 20 year old. My boss mentioned I should probably invest some of that money. I asked her for more info and she referred me to someone else in the company who was her friend and knew about investing. I asked him about it and it was always like "sure, sometime we'll talk" but it never happened. My mother didn't know a thing and my father wouldn't help. I felt totally overwhelmed and stuck and didn't invest anything, not even a 401(k) at the company. A couple years later I met the man who would be my DH, and I learned his mother had made some good financial choices and had a portfolio that she partly lived off of (semi-retired). I asked her what her suggestions were - at the time I had $8k left. She said it wasn't enough to do anything with. SIGH. I spent that $8k during college on pizza and books (ok, and also a trip to China). What a frikken waste.
I am responsible for the fact that I blew the money - I could have researched personal finance, bought books, consulted a professional, whatever. But I do feel like a lot of people kind of let me down too. Don't let this happen to you.
Get a book from the library or buy one. Personal Finance for Dummies is a good way to get started - just because it's so unintimidating. If you are literate, you can read it and get a sense for your options. From there, read more based on what seems to make sense for you.
In the meantime, sure, put your money in a mutual fund or something if you want.
However, I must add this food for thought, and the disclaimer that my opinion is NOT a popular one. I think that regular people investing in the stock market at this time in history is not a good idea. They will tell you that historically, stocks have earned 10%, which certainly does beat any savings account you could possibly find. However, I think it's a little misleading - you can't count on making 10%. You can't even count on just breaking even. Your skill, your resources, the amount of money you can parlay into stocks all make a huge difference. And the economy makes a huge difference. Now might be a really great time to buy, since things are depressed. But that assumes things will go up again - and I'm not at all confident that we're going to see an 80's style boom again in my lifetime. Anyway, this is not advice for you because it's just my personal opinion, but I felt compelled to answer and wanted to throw this out as a thought. What to do with money if you're not investing it? Pay off debt, save it, turn it into nonmonetary resources that will hold their value. So there is my extremely unpopular view.