@Rhia: What kind of content are you wanting to make? Clothing/accessories? Props? Hair? Skin/Materials? Aside from weight mapping, content creation really has not changed much for Poser since forever. The methods have improved and become a bit easier but the basic steps for creating content are the same whether you're making it for P4 woman or LF2.

Materials are a bit different story. The basics are still the same but there have been so many changes to nodes and settings between 11, 12 and 13 that they have to be customized for each version you're wanting them to work in.