Thank you for being so generous with your knowledge. Be sure I will bug you if I get stuck
Today I spent sometime reading your tutorials here and other documents on the VDP. Then I copied your code(the randomize routines come specially handy I don't know if I am going to use them as they are but they are a starting point ) from this thread and adapted it to my needs. And at the moment I have graphics mode 2 working + sprites. Now it's time to get dirty with 'real' TMS9900 assembly as I need to start putting the game together(I am coding the same game on the 6502 and 6809, so I only need to translate what I already have and then add what else might be needed).