Four extents, all saddle stitched. Pages print in signatures on shared sheets and are folded, not printed individually, which is why the page count has to be a multiple of four. Filter by how much editorial structure you need.

Four sheets, contents page viable, several features and real structure.

Two sheets, saddle stitched. It should read as an edited publication.

Any multiple of four, your trim. The presets do not fit the content.

One folded sheet, unstitched, a single announcement or program.
Four pages is a single folded sheet and needs no stitching. It will read as a leaflet, which is right for one announcement and wrong for anything meant to feel like a publication. Eight pages is the first genuinely bound extent and the minimum that reads as edited: a cover, a lead, a secondary piece and a back page. Sixteen is where a contents page becomes possible and a heavier cover stock starts to matter against the weight of the text block.
Plan the page map before writing rather than after. Filling a fixed extent with finished copy is much harder than writing to a plan, and sixteen pages holds less than most people estimate once images and white space are allowed for. If you want a section on different stock, say so early. Pages print in groups, so a stock change has to fall on a signature boundary rather than mid-section.