Honestly? My first thought is, "don't".
But that's not a helpful response. I'll explain my thinking -
A lot of people think about starting a channel because they think it will be the path to success. The problem is, most of the examples that ARE successful, are not common examples. Most channels go nowhere and earn nothing. You just never hear about them, you only hear about the successful ones.
Since you are asking it with the phrasing you used, you clearly haven't put down a plan. You need one. Just like a business, you need to know how you'll be doing videos, what kind of schedule you can realistically expect to produce, what your content will be, how you'll promote the channel, etc.
There's enough bad YouTube content already, you don't want to add to it.
Now, all that being said - if you have realistic expectations and you understand that trying to make any significant income, or get any significant level of exposure from YouTube will take the same amount of work as a full time job or more - OR if you don't expect anything from your channel, but you will at least produce decent content - go for it.