After many delegates have spoken and introduced their ideas on the topic, blocs of countries that have similar ideas will form by delegates passing notes and agreeing to work together. After the bloc is formed and most delegates have spoken at least once, a delegate will motion for an unmoderated caucus, at which point the bloc can convene freely to start to write working papers, or draft resolutions, that explain the issues the committee wants to solve and proposes solutions to them. A working paper is considered a resolution once it has been voted on and passed by the committee. For great resources and examples of working papers, check out this Best Delegate guide.
Sponsors are delegates that wrote the clauses used in the paper. Signatories are delegates who did not write the paper, but would like to see it discussed in committee.