[herr_oberst]

I'm going to be honest. The bike you have and the drivetrain and brakes that it came with will work fine for you for now. If you start upgrading, you'll be on a slippery slope trying to chase something that you don't have enough miles under your belt to identify. I mean no disrespect at all with that statement.

Concentrate on learning to ride. Learn how to work the components you have now. The stuff is brand new, and it was designed with trickle down tech from the upper groups - it's better in many respects than what was available in the upper groups not that long ago.

If you want to get your hands dirty, make sure you know how to adjust the cables and the pads, (and how to replace pads) and how to clean and oil your chain.

You have brand new bike, it has a triple with an 8 speed cassette. That should be enough gears for the ride that you'll be doing. There are going to be a whole lot of new sensations that you will be feeling as you start to train for two 75 mile days in a row.

The way your feet and hands and butt feel after 25, 35, 55 miles, the power in your legs, your whole mental outlook as your spend a whole morning or a whole day on top of a bike, with another day to go.
Your body will be starting to tell you things it needs, and you need to be aware enough to listen; that information is learned through seat time.