One thing I can say about progressing vMoL on any character is to do the difficult modes in all 3 Craglorn ones and most veteran DLC dungeons first to ensure you have learned your role sufficiently well. Also Templar is by far the worst class to tank on, and I still don't get it why so many people pick it for that role. You'll need some gear sets to compensate for the lack of sustain, and also to pull. Swarm Mother may work relatively well at Twins when you need to pull the adds on the boss.