Aerial roots, as their name suggests, are roots that grow on plants above the surface of the soil. These are completely normal and help the plant attach to tree trunks and support them in growing higher and attaining brighter light.
Good wiring takes lots of practice to do effectively. Work towards using as little wire as possible to achieve your goal. Selecting the right wire balances cost and function, with the copper wire being stronger (but more expensive) than anodized aluminum wire.