1) Select New Scene
2) Select the models you wish to use ( usually sequence makers specify which order of gender occupy which slots).
Some creators use custom textures, but if you don't have a particular set of base clothes or the specific texture, you can always substitute in the sequence time line once you have the sequence loaded up. If you do download a custom texture, make sure you enable it in the settings menu > Mod tab (paintbrush and easel icon).
Sometimes it's best to use the creator's recommendations of a particular model because they are tested for use in the particular sequence with minimal clipping issues.
3) Select sequence and then note which room in which the sequence takes place. It should be provided in the download details or you can tell by the preview shots as well. Make sure you have the setting of the room purchased as well.
4) After the sequence loads and you can see the room, click the folder icon and select the 'Community' tab. You should see the sequence that you want to view.
5) After you are done you can always delete the sequence by going back to the folder, selecting the item and clicking the trash can icon or you can keep it.