It is tempting to start dragging parts around a board because layout feels like progress. Resist it. The layout tool builds every connection from the schematic's netlist, so any mistake there becomes a mistake in copper that is far harder to find later.
Finish the schematic first
A complete schematic has every part, every net named, every power and ground connection explicit, and every pin accounted for. Decoupling capacitors are placed next to the ICs they serve. Pull-up and pull-down resistors are present. Unused inputs are tied off. When you can read the schematic and explain what every net does, you are ready to lay out.
Let the tool check you
Modern EDA tools run an electrical rules check (ERC) on the schematic: unconnected pins, outputs driving outputs, power nets with no source. Run it and clear every warning you do not understand. Five minutes here saves a respin later. See the Electronics 101 lesson on reading a schematic if the symbols are still unfamiliar.