Follow these steps and you shouod manage to get it done by yourself.
1. Download a
textdraw editor from the SA-MP forum, at the filterscrips section (I personally prefer
Ipleomax's one);
2. Run the
filterscript with your server (find the instruction at each filterscript's topic, where it has been released);
3. Create
new textdraws with the editor while in game (use both boxes and text, as you see in the image above);
4. Save the generated textdraws and convert them to
Pawn language (the editor should have the function while in game);
5. Take the texdraws code from the generated Pawn file and place them inside your gamemode, under
OnPlayerConnect or
OnPlayerLogin callbaks (The only difference is that they will appar faster on your screen when placing under
OnPlayerConnect pubic, in the same time with the 'Connecting to..." text outputed by the SA-MP client);
6. Compile the script.
Thanks all buddy. Now login on your server and you sould see them there.