WASD to move Tile size determines the zoom and size of your world. Render distance is how far out the tiles are generating. You will experience lag with higher render distance but less spikes cause by new tiles being found and generated.
it was actually pretty easy for some reason except for when it wont save because the lists are too full. I would recommend world size 2 and render distance 3000 at world size 8 you can pretty easily walk to the edge.