Hi rofum, and welcome to this forum. Probably not worth a whole lot. However, I may be wrong. One of the best ways to find out is check on Delcampe and see if these FDC's have been offered / sold before. You can also try ebay.
You're in Croatia. You should have access to ex-Yugoeslavia stamp catalogs. There, you'll find a theorethical value of the stmaps and FDC that you have.
But, I don't think you'll become rich with the sale...
the FDCs are fairly common, with the Sarajevo postmark making them slightly less common (vs. the Belgrade postmark that is the norm). no idea what kind of market value they have, but that is something that I would offer somewhere around $20-25 for, just because I am obsessive with the unusual stuff such as this.
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