Best advice I can give is the one least likely to be taken by anyone.
Go to TC1 and create a Tamer. Go tame the Greater Dragons and die until you no longer fear them.
Because if your going to be afraid of them, they are going to munch you for sure.
Try lead taming those guys and only seeing "you are to far away" is the clear symptom you need to go to TC1 and die a bunch more times.
Now for a way to tame Greater Dragons.
First off, if you have not done so, then make a Hot key to initiate the tame.
Mine is simple
Useskill Taming
WaitforTarget
LastTarget
I have a Logitech G15 keyboard(x2) and have bound a G key to repeat that key every second.
Others use uoa.
Now get a Cu, buy one if required but get one.
Now go to Ice Dungeon were the White Wyrm lives.
Honor the White Wyrm and Kill it with the Cu. (Advice go to TC1 and get all the components on how to do this down pat, as it is likely you will die a lot until you do)
Spend about 2 to 3 hours honoring the WW's
Your honor will now be high enough to tame the GD's.
Pick a "GOOD" GD, get close to it and Invis yourself. MAKE SURE NOTHING IS AFTER YOU.
Now when your sure NOTHING IS AFTER YOU, honor yourself and spam the crap out of that Tame key. You will get the "You anger the beast" message but you will also notice neither the GD or anything else is interested in you.
This condition is about 1 minute +- 15 seconds.
When you have it tamed, then feed it a raw meat and gate out.
Now use that Greater Dragon and beat the crap out of the Honored White Wyrms and keep it Honor high.
What constitutes a Great Greater Dragon? Just my 2gp's here
all values are pretame
HP 1770 min
Int dont really care
STR 1280 min
(dex will always train to 125 so is not relevant)
PhysResist 80+
FireResist 80+
EnergyResist 75+
Cold and Poison is not generally a factor to me.
Wrestling 130+
Tactics 120+
Resist Spells dont care
Magery 115+
Seeing as to how your in the building process, I will say the chances of you finding a GD like that are slim to none. So if I were in your boots, I would focus on things in this sequence, PhysResist,FireResist,EnergyResist,HP and STR, Wrestling, tactics.
Your going to need to boot yourself up and that is going to take time, but hey I hope you get lucky