I'm not the best one to answer this, probably, but am going to, in part to kick you back up to the top. :-)
I'm guessing you are in early/mid 20s? No student loans or other debts??
For the options you present, plow it into both the 401k and a Roth IRA (and, do you have a ROTH 401k option at work???). Assuming that you are in the lowest tax bracket of your working life, now is the time to take full advantage of Roth options and reap the benefits of decades of compounding. If you look around this site, and the "boglehead" site, you'll find ways to access 401k monies before 59.5, but that is long range stuff.
I would recommend against pulling funds out of retirement accounts or IRAs for a house. Leave them in place and peer in occasionally to watch those dollars reproduce. :-)
Fidelity? I don't know anything personally about them; Vanguard is generally a good choice for cheap and easy. Any fees on the IRA at fidelity? Access to vanguard or similar etfs? What are the commission charges, if any? (You can put roth $$ into ETFs, mutual funds, stocks, bonds, etc. It is just a wrapper for an investment account.)
Regarding individual investments. Don't go beyond broad based index funds until AT LEAST, you don't need to ask for guidance. Example: Most hedge funds don't beat the market. Most mutual funds don't beat the market. No broker available to a newbie investor beats the market. etc. etc. An individual can do well, even today, but you need to figure it out and find your niche--and realize that the odds are against you. Example of my eldest, who is in mid-20s. Math geek engineer with econ minor who thought he'd figured out some high octane strategies.... Luckily, he learned a cheap lesson as he didn't have much to invest at that time. Now he has Vanguard index selections in both his Roth IRA and his 401k.
Good luck, and hopefully some younger folks can chime in here.