To "read" a house you must examine three things:
Strongest in influence over affairs of a house, because most directly concerned with those things, are the planets occuyping the house by body, if any.
Second in order of power is the lord of the sign on the cusp, and if there is an intercepted sign in the house, the lord of that sign also. What is the lord's "condition" by sign, house, aspects and so on? Retrograde, combust??
Third are aspects to the house by planets located elsewhere in the map.
Usually, planets in the house indicate what happens first, and then the lord of the house shows how it turns out in the end.
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With Aries on your 8th cusp, Mars is lord of the 8th.