No problem, sorry you had troubles with your cake!
When your fondant covered cakes are pulled from the fridge a bit of condensation forms (you'll get less condensation if you box each tier separately then wrap in a large bag even a clean garbage bag will do). You don't want to touch the cake until all the condensation (moisture) has dissipated-cake will look shiny when wet, when that goes away its ok to start stacking your cakes then adding your decorations.
Also, your right, ganache will perform much better then your whipped topping (you'll be able to get much sharper corners as well which makes your cake look cleaner). Your fondant should only be about 1/8' thick, just a thin layer.
You need to have a board underneath each tier as well as using dowels or your top layer will drop on the other. All your dowels should be cut the same height, your cake doesn't look centered so the weight probably wasn't dispersed evenly.
When attaching your decorations you should use royal icing or chocolate-hold them in place for a few seconds and they should stick just fine. I imagine your fondant was too wet which explains why your decorations wouldn't stick.
These things happen, it's part of learning