Chessex Megamat – Vinyl RPG Megamat – Smooth & Tough – 34.5 inches x 48 inches – Reversible 1-inch Squares & 1-inch Hexes – TTRPG RPG DND D&D Dungeons and Dragons,CHX97246

There are multiple solutions for 1 and 3. But a beginner friendly and low tech version is to buy a battle map that you can draw on with erasable markers. Will link to an example of one that has squares//hexes to show 5 feet in game, and that will work with wet erasable markers. https://www.amazon.com/Chessex-26616-Combat-Mat-Megamat/dp/B003WZIOHQ/ref=mp_s_a_1_4?crid=34RWPLID1F9ZN&dib=eyJ2IjoiMSJ9.bMqst1wdHkI6XyRopsHVObyniq9-grApZPbCZ9ZExt9PIL4HVOgejXO0WJz4DexcYyuqlByYm48li6Y3KhJU1rSTTA_D5gOifpyCPyEdBEhEwJEOJylKffOhBArne88sFj18dTk-rEzXwGEd9LXwpqWRHV9FMd1QjL3RlHKqeSPs1tnkU--Nm77FjWiNPxq602_6DDlBcx6xq5O957S1og.08Dy4k-ULJ-ITXaj9vegIlE8crFFT7LD6jaPWEYyk8U&dib_tag=se&keywords=dungeons+and+dragons+battlemat&qid=1780843980&s=toys-and-games&sprefix=dungeons+and+dragons+battlemat,toys-and-games,228&sr=1-4