MigrationDesk is a community, not an agent (nor is affiliated with any). You can post here without an account, but all unregistered posts will be queued for moderator approvals. You can register a free account to bypass moderation and enjoy additional features such as post notification, Live Chat etc.
You can either apply regular visitor visa, or sponsored family stream of visitor visa (both are of subclass 600). The sponsored family stream would require the least involvement from your parents, it's you who will need to supply all sponsoring/financial (your) documents.
Have you seen the new statistics page we have introduced? Check out this link and keep an eye on the Statistics section for new modules to be added in near future!