YouTube help plz help reply too plz

Hi

I wanted to start a gaming YouTube channel but for now I was thinking of doing a PC GAMING YOUTUBE CHANNEL but I have some issues:

1. I know how to record the games on my PC but I don't want to waste any money so do you people know any free but good, no lag screen recording software???

2. I don't know how to record my voice but I was going to buy a Razer Kraken Pro headset for this use but how do I record my voice????

3. I don't want to waste any money on this setup kinda thing so can you people try to make it money free (NO MONEY)

Thanks

Plz try to solve my issue

Plz reply back