parsnip
Grandmaster
ogre lords, cyclopses, ogre mages, dragons, drakes, anything with a lot of HP basically and especially paragons
Good list! Some more suggestions: Titans, vampires, ancient lichs, deep earth elementals, paragon ettins/ogres/trolls/lichs etc
Zerkers - Keep your AR low, joust if necessary, slayer armor very useful, don't use a shield/parry (too much AR)
Defense - Keep your AR high, usually no need to joust, slayer armor useful but not essential especially at higher levels, start with parry and always have a shield equipped but you can drop parry to 50 at later levels
Given the types of mobs you will be killing, arms lore is a no brainer. It makes a huge difference to consistency of damage and therefore XP gains.
I suggest you close the XP progress while farming, it is too distracting. Once you know which mobs give good XP, close the XP progress and just go farm and have some fun. If you are steadily farming the right mobs, your XP will raise fast enough - Just don't expect to be level 10 in 2 weeks!