I'm trying to mine Monero with a not particularly powerful GPU on a laptop(around 120 H/s) and I was wondering:
What would get me the most profit: mining at a popular pool with a high hashrate therefore getting a lot of blocks however very low reward
Or: mining at a unpopular pool with a low hashrate therefore getting a lot less blocks however I would get a higher reward per block found
I'm not too interested in gaining hundreds of XMR, but I was just wondering if anyone could help me with this before I waste lots of time trying out different pools etc.

I was planning to mine Litecoin on a laptop.
I don't care too much about profit, but I was wondering whether mining on a laptop with a GPU would possibly fry or destroy it.
My laptop has a very good cooling system and I would only leave the mining on for a couple hours at a time.
Can anyone tell me if I could damage it badly by doing this?

Making bitcoin without investing some amount of money is difficult and mostly ineffective. Mining requires you to buy an ASIC, which also requires maintenance and a lot of power. However, I would say other than reading this is the best way.

Personally I would keep my current job but leave bitcoin as a little side-project. Maybe with the income you would earn from a job could be used to buy an ASIC to mine bitcoins. You can leave them on for periods of time while you go to work. I'd suggest doing that before thinking of living on bitcoin, because why not live on both?