Learn the right names for the components and buy a reloading manual 👍
A load needs to be developed, there is a lot of information of where to start on the powder manufacturers websites, Vhitavouri for example ,, https://www.vihtavuori.com/reloading-data/rifle-reloading/?cartridge=7 n
They show loads for 3 different 75gr bullets, with N140 and N540 being common to all. Your rifle is slightly different from anyone elses so thier loads may no be ideal in yours, they may even be dangerous. What powders can you get localy ?