Adding application

Hello. I would like to ask for some help is someone can please help me with my issue. I really do not have much experiance with gateways, first time using it and setting it. I bought RAK7249 and i made lorawan server. And gateway is working

But i have a problem when i want to add applications. I bought some NODE (end device) it should be OTAA class C and with that i got DEVEUI, DEVADDR, APPKEY and APPEUI. So i try device profile and i was try all LoRaWAN MAC version *: 1.0.0, 1.0.1, 1.0.2, 1.0.3 and 1.1.0. But seems non of those are not right or i dont know. Because let say in 1.1.0 i must then put two keys Network key (LoRaWAN 1.1) * and Application key (LoRaWAN 1.1) *, so application key i do have with product, but i didnt get network key. So this network key i should get from NODE producer to? Or those NODE that i buy does not support those OTAA lorawan mac verison. Hope someone will understand the problem and could help me. Thanks for any help.