My suggestion for someone who's played all the character classes to 70 and are trying to form their team is this:

Make a team of level 1 newblets with the same configuration of your pre-existing character team that you want to form. (e.g. you have a warrior, mage, priest, 2 locks, make a team like this)

Now play them and configure/get used to them. Run a couple of low level instances to get fully ingrained with your setup.

Once you've done this, mirror the setup on the higher level classes. The only thing you will really need to do is add the higher level spells/BC spells to your configuration, but your experience with the lower level team should help ease the pain here.