If I find a block, does that mean that if I was mining solo would i have solved that block too or the fact that I was pool mining made it easier for me to solve the block?
Nope, the pool sends you special code that goes into every share. You just got lucky with your miner's code plus that special code only available at that pool and you solved a block, which you now share with everyone else on the pool.
When mining on pool, the advantage is that there are more miners trying to solve a block on their own or do all the miners in the pool work as one?
Yes and yes. All miners work as one as far as the block is concerned. And there are more miners working toward that goal, each as a "hive mind". That's oversimplified, but that's the gist of it.