If you are making a map or mod that you intend to release here at FS-UK, then you can make a WIP topic for it if you wish. It is not compulsory, many mods are released without a WIP topic.
If you do make a WIP topic, then be sure to select the correct board in the Work in Progress area
Modding Partners have their own areas for WIP topics and other information.
Please include [WIP] in the title so that it is clear. Please also include the FS version in the title e.g. [FS15] [FS17]
If you do want to promote your mod or map then a WIP topic is the only place you should do this - not the gallery or any other topic.