Post by wrlwnd
I would recommend that you get all 3 as you will go through the old world quickly, expecially if one of you create an account and then use the "
Recruit
A Friend" for the other account. If you do the RAF, when you are playing at the same time and in a group, you will both get the following:
What in-game benefits will linked accounts receive?
* Recruit and veteran characters can summon one another to each other's locations across the globe.
* While adventuring with your linked friend or family member, you will each gain triple experience while partied up to level 60.
* For every two levels recruit characters earn, one "grantable" level is gained. Recruit characters may then grant these levels to lower level veteran characters.
Look at the recruit a friend
FAQ and read all about it.
Edit to add:
No you will not need them all at the first, but if you will be using the RAF, you will need the expansions soon as the leveling is much faster now in the "Old World"
It is also unfortunate that you are now looking at doing this instead of several weeks ago when the old ones were on sale.