To run a mining pool you should be a full-stack developer, bitcoin-expert and security-expert. You'll need to run the business side of things as well. And you have to do public relations and customer support, etc. It's quite a wide skill set. Easier to do with a team than a single person.
You should be willing to work very hard, putting in a crazy amount of hours.
You must have your services monitored and be ready to wake up in the middle of the night from a screaming alarm if your systems go down or become unstable. Then rush to fix things. Usually problems will occur at the worst times, whether it's Murphy's Law or because someone decides that the time from christmas eve till new year's eve is the best time to conduct heavy DDoS attacks against you.
The moment you launch a pool you have made a whole new group of enemies. DDoS attacks will be frequent and hacking attacks will be constant. It is unlikely that you will ever learn who any of these people are. But you can be sure they'll make a major effort to hurt you every single day.
Any little bug or security vulnerability can have disastrous consequences. You'll see other bitcoin services go down in flames. Watch their users plot how to get their money back, or just plain revenge.
Being a pool operator means walking a fine line between failure and insanity.
Hey, what about me launching my own currency? Will you mine it?
No.
There are hundreds (thousands?) of people doing the same.
They decide they want to have their own coin. Usually it's a plan to create a new coin, premine the hell out of it, then the whole world will start using it "just because" and they will be rich. So they take bitcoin or a bitcoin-clone and rename it. Sometimes the software still says bitcoin in a few places because they're not very good at renaming things. Noone uses the new coin. Then it dies.
The problem is that they are starting at the wrong end. You have to see the other person's point of view. Why would they use your coin instead of bitcoin? What will you offer these people? How will your coin be better for them than bitcoin?
Starting with an idea on how to improve the world and going from there is much easier than starting with the idea that you want to be rich/successful/whatever and then asking yourself how you can accomplish that.
Same thing goes for starting a new mining pool or a new anything.