It is very time intensive. I was told "you can't do it by yourself" when I set up my first website this year. (my very first website ever was in 2010 and that was an expensive mistake but valuable lesson).
Naturally, I had to make things harder on myself by setting up a network of two websites.
My only advice is you will need to stick to it with zero to little reward for (at the very minimum) the first three months. So if you want to make things easier on all the half-days you will be tempted to quit, make a content site that is based on something you're genuinely interested about and would be passionate to read yourself. You'll also want it to be something you would like to be seen doing in real life. No point being a different person on the internet.
Avoid these pitfalls and it makes it less likely to give up. You'll only see real passive earning income (and "passive" is a giant misnomer here given the time investment) 6 months to a year in on average. So find another reason to do it other than money.