Anybody who understands German grammar relatively well, please answer my question!?

Ok, so basically, when do you use 'ihr,ihre.ihren,ihrem', or 'unsere, unseren' etc If you want to say her money, it would be 'ihr Geld' since Geld is neuter? If you say the boy bought jewelry for her, it would be 'Er hat Schmuck fur ihren gekauft'? Since Schmuck is masculine, and fur makes the sentence accusative?