Starting with xtreme legends complete edition makes the most sense for newcomers since it offers the most refined mechanics and comprehensive content to learn the basics. The story modes give you a good grip on different characters, and ambition mode lets you experiment without too much pressure. Origins works well too especially for solo players, since you follow a wanderer character learning the ropes which naturally introduces core systems

Avoid jumping into 9 as your first since the open world setup can feel overwhelming and the combat changes might give wrong impressions. The older ps2 titles like 3 and 4 are classics but pretty dated now and might feel clunky compared to modern standards

Focus on getting comfortable with the hack-and-slash combat fundamentals in complete edition, learn the officer mechanics and try different weapon styles to see what clicks. The three kingdoms setting becomes way more engaging once you understand the flow of battle and character relationships. Good to know that musou attacks clear groups fast but save them for tough officers or when surrounded. Tip - experiment with different characters early since each has unique playstyles that might suit you better