I don't use Fidelity but they are a fairly well known in the investment world. I'm not familiar with any of the plans they use, I tend to stay away for any plan or automatic investment because a broker is going to put you in funds that give
them the best return AKA: they'll invest your money in funds with the highest fees or kickbacks.
Personally, I'd start off by trading Fidelity mutual funds manually. They will let you trade Fidelity branded funds for no transaction fee. That basically saves you $8 every time you buy & sell. Also, you can put your money in the sectors you want - and at the times you want.
Here is a list of 200+ mutual funds Fidelity offers that can be traded inside your account commission free. Most will have minimum initial investment (like $100 or $1000). Most will have early redemption fees, but the key thing to understand are the net/gross expense ratio. In general, they have fairly competitive fees but it's something you want to keep close eye on as you build your account up over the years.
https://www.fidelity.com/fund-screen...&ntf=N&mgdBy=F
Lastly, remember you are putting new money to work when markets are at all time highs. That's not the worst thing if you're 29, but managing your account yourself allows you to hold cash or sell out when markets get a little frothy. These investment banks want you to think noob's can't manage their own money - but that's false. Since you are young, I'd take an active approach managing your money now - so when you are 49 and have $500k+ in your account you know what you're doing. In 2008 - people got whacked because they had no control over their money.
Index funds will typically have lower expense ratios and a large number of holdings. They are designed to track something like the Nasdaq or DOW, and they are easy to track because most news outlets report how those index's did each day. Sector based funds typically have higher fees, a more focused group of holdings & a fancy name like "Capital Appreciation Fund" - As you get more into investing, you might like a certain sector, like banks, health care, foreign co's ... ect - then you can invest in a basket of stocks related to that particular sector of the market.
While I'm not trying to deter you from investing your money however you wish, since you could be doing a lot worse with it - I recommend taking at least a portion of your money & trade some funds or even stocks yourself. When you do this, I find you become more 'invested' in where your money goes. I find you care more, and it's better to learn when you have a small amount of money, than loose a fortune when you are closer to retirement - like many people just experience in 08/09.