Welcome to AoS, so to answer your question:
You don't pay for upgrades, that includes increase to units or the special items they carry. So the cost of 10 Tzaangors with icons and horns costs about the same as a naked unit of 5. of course the game also enforces WYSIWYG.
Unless stated otherwise you can have multiple Icon bearers and Brayhorns in a unit, however they are allowed one special item per model, meaning you cant give a horn to a model that has a flag and vice versa (he needs one of his hands free to carry his weapon of course.)
Also it's worth noting that having two weapons does not give you an extra attack unless stated in the stat card so for a Tzaangor with two savage blades, he still makes 2 attacks but they're +1 to hit due to having a pair.
If you don't want to use the points system for a pitched battle, you can use a substitute points system, there's a few scattered around the net to help you out there.
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