[showbis]

marzipannudel,

welcome to the forum,
we will do our best to help you on your path
Dev kits we have but they launch so many it is at times hard to know what is the latest and if it is legit or not
on the tools for making mesh I am assuming you will use blender and avastar.

Here you may find video tutorials on how to put blender to the best use
If you learn the tools in general you will know how to master SL meshes also

Please check all the rules,
learn how to share and knowledge is also a nice thing to share
and enjoy CBC

showbis