For beginners looking to buy their first surfboard, the document recommends starting with a longboard that is at least 24 to 36 inches taller than your height, at least 19 inches wide, and at least 2.5 inches thick. Longboards provide more stability for paddling and catching waves as a beginner. The document also recommends soft top boards made of softer, spongy materials for added safety, as beginners are likely to get hit by their boards. Once surf skills have improved, the document suggests upgrading to a higher performance hard top board.