Q: How much of a role does the Voice Over play for a new channel which is focus on sports and gameplay?
A: A big role for monetization. You can clips things together and create a compilation. But YouTube wants more value these days. Voice overs are very important. (but it doesn't need to be complicated) YouTube viewers tolerate bad video image better than bad sound quality.
In other words, they will be more likely to stay on your channel if the sound is good.
Q: Do I need an expensive mic?
A: Not really. Quality mics really need to be respected and are incredible. 
However, the tech has come so far these days that you can get a quality mic for doing voice overs for a much smaller price tag than just a couple of years ago.
If you want very good quality for around $140, you might consider a Blue Yeti mic.
They sound great, connect with USB right into your computer. Very simple to use. They can pick up sound directly infront of them or you can adjust so it collects sounds from all angles. Blue Yeti mics are well reviewed and very widely used.
The one note is that they tend can pick up too much background noise. They are THAT sensitive. But don't let this stop you, it's just THAT good of a mic for an incredible price.
But if you're concerned about background noise being an issue, you may want to proceed with caution.
For general YouTubing, without concern about a bit of background, there are perfectly fine mics under $50.
The best example of this is easily the TONOR TC-777.
The TONOR TC-777 is a quality mic and, frankly, surprisingly fantastic. It plugs into your computers USB and you're ready to go. No software, no fuss.
This mic is a best seller on Amazon for a reason and at under $50, it's a steal.
Tonor has a history for making quality mic's at reasonable rates.
This model sounds incredible. I use it right from my laptop and my Voice-Overs sound great. I don't feel any need to go into my tiny recording room to lay down tracks and modulate them. Very satisfied customer.
Connection is right to the USB, no software; my computer recognized it the first time, and off I went.
Full blown condenser mic that requires no additional software. It comes with a shock absorbing stand, a pop filter, a very sturdy metal tripod, and usb cord.
You'll find the sound crisp and smooth. This is a good mic at a very good price.
Definitely one to consider for beginner or pro. Here's your link.
In either case, you'll probably want to edit your audio and modulate just a bit to create good, full quality. Not a deal breaker, but an idea.
Audacity is the most used and it's freeware you can download. There are a ton of tutorials on it within YouTube.
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