I have seemed to solve my groove problem by adding a groove.mip as well as adding this entry to mytrack.tex file:
4003 0 0 10.0 10.0 groove
Next thing will be to add some height infos and to resolve the gaps which will for sure arise
Will start working a bit on the AI but overall I have a good feeling about the guide. Remember this will be a beginners guide for newbies like me

I have seen some nice advanced stuff.
At least till now everything is done via freeware tools which is good.
About the collison box thing. It's attached to a polygon which itself is attached to vertics. Would it be safe to assume that I need the vertics like nails which are needed to 'hold' the polygons ?
Another thing I will try is to create a 3D object in Blender, export it to ASE or 3DS and import it. What is the best choice: ASE or 3DS ?
Still interesting to get this thing going. When I'm done with most steps I will save it and begin with a fresh new one and try to be more straight forward