>>2511452this although i will say a very easy way to get motions is to look for them on youtube.
if you want stages, go to deviantart and search "mmd stage". DA also has models, but theyre very hit or miss and rarely are full body. you are likely to find shit quality models on DA, but there are some gems. for you model needs, i recommend going to tstorage and using the catalog. you need to make an account to use the catalog, i recommend not using a real email because of pic related. probably not a big deal, but still. once you make an acocunt, the catalog button is on the bottom of the page.