Sumps are great for two reasons: they increase water volume (the more water you have the more stable your system) and two they allow you to hide equipment.
Canister filters are generally frowned upon because they need a lot of cleaning and it's hard to tell what is going on inside them without opening them. Having said that, there are people here who use them with effectiveness. I had one on my first tank.
The biggest thing you can do now is learn. You're asking questions and listening which can only be to your advantage.
As Strickland said, if this was easy everyone would do it.
We all started somewhere, learned and no matter how much we know will always be learning.
Read, ask questions and be patient. Only bad things happen quickly in this hobby!