The absolutely best accessory as well as necessity is 'Time' put into practising and learning Poser. Every day, don't walk away from it. If you do that, eventually, you'll be doing everything. Keep in mind there are tons of tutorials and how-to's and galleries to surf to. Find some tutorials and try to do at least one a day. Then, after following the tutorial, apply it to something of your own. Subscriptions are valuable, too, not only for the 'stuff' but for the supportive communities, tutorials, how to's.