Basic Meshing

hi! i'm not sure about what type of content you're asking exactly. But yes, any tutorials for blender are fine. Once you have the mesh ready you can follow this tutorial.

Clothing is a bit complicated if you're just starting.. but for objects i would highly recommend looking for tutorials in youtube. You can start with a begginer's tutorial, or with a cup. Starting with a very simple mesh will teach you the basic tools that will help you out in the future.

Hi kaesimmer,

Welcome to Studio Forums. Here on the forum you can already find some very good beginner tutorials, made by Orangemittens.
In these tutorials you will learn how to make your own painting mesh. It will start by making the mesh itself, but will also show you how to texture it and how to make the shadows right:

Section I - Creating a New Mesh
Section II - Mapping Your New Mesh
Section III - Making a Texture for Your Mesh
Section IIII- Importing your new mesh and texture, making your swatch thumbnail, replacing the shadow and lower LOD meshes and creating a second swatch for your painting.

If you got any questions about certain parts of those tutorials, you can ask them in those topics here on the forum.

I would add the following to the above information, if you use tutorials from the Blender community or YouTube, make sure you're using a tutorial that shows low-poly meshing techniques for any mesh you plan to import into a .package. Femmejean is correct in saying a high poly meshing tutorial is a good start to getting to know Blender, but you won't want to import a high poly mesh into your .package. Ultimately, Sims 4 is a low poly game and learning low poly meshing techniques is important. In my opinion, making a mesh look good using low poly techniques is more challenging than making a mesh that has no poly limit. I also agree with Inabadromance and AdonisPluto, starting with a simple project is the smart way to go. Once you get the basics down (both of meshing and of getting the mesh into the game) you can move on to more advanced projects. One thing to be aware of as you browse Blender tutorials is that many of them are demonstrating features of Blender that will not work for Sims 4. For example, you can learn how to use Blender to make particle hair, but the game will not recognize hair that is made using this Blender feature. As Bakie said, our tutorial section has a start to finish object tutorial that's a good place to get started if you're interested in object meshing. If you're interested in CAS meshing our start to finish accessory tutorial may be of greater interest to you.

While I would agree with AdonisPluto that you can use any 3D editor to make object meshes, I would not suggest using Milkshape for CAS meshing. Milkshape is a very old tool that has had no updates in the past seven years and it is not able to perform the tasks necessary for Sim 4 CAS creating. CAS clothing requires a second UV, vertex painting, and complex vertex weighting. Milkshape is not able to handle more than one UV, it cannot do vertex painting, and there is no easy way to transfer weights from an EA item to your item as you can with a more up to date like Blender, 3DS Max, or Maya. Even for object meshing I would not recommend Milkshape to anyone but a person who has been using it for a long time and doesn't have the time or inclination to move on to a superior tool. If you're brand new to meshing, you're far better off learning to use a more sophisticated 3D editor.