help for gmdl

hi guys i have a fat psp-1000(ta-o82)and it was brick before few months after i fix it with modding my battery to pandora and make mms and i leave it with 3.71 m33-2!

Sorry for my boring post i write up but i tell you all this because happen in 2008
so i am again very noob to psp world!:-)
Now i want to put in my psp GPS and before i buy it want to see if it will work to my country and for the places i want.
I find the software mapthis and it works good i thing ok with this.
Now i want to put my country's map( Greece ).

So i want:
1)If someone know a tutorial to explain how i can use the GMDLto make a map cause i download 1 map but i don't know after nothing to do.
2)tutorial to explain how to use (map his)

3)this is question:In some post here i see the program YUM assempler but i try to find it but i find some pdf can someone give advise for this

Sorry for this too much post i try find alone but nothing and today i find this forum and looks to know everything. (i hope). :-)

thanks for read this!!!