What kind of the game do you want to make?
Is it for self learning, prototyping or public release? If you just start learning how to make games, the images and sounds are not very important. But if you want to build games for money, you still need to build the prototype first. Only after you have the running prototype, you then will need the high quality game resources.
Finding high quality game resources isn't too hard. You can visit Patreon or pay $5 on Fiverr to have the professionals to create it for you.
Don't give up easily, friend. Building games is fun. The process is not easy but once you see your idea run on the screen, that is very rewarding.