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Rogue would be the easiest starting class if you have never played before, rogues are all about damage and really cant do much else. Once you hit level 20 or so soloing isnt going to be much of an option so your going to have to group all the way which isnt a bad thing we have a great community here! in groups youll be doing damage, some zones require you to open locked doors but not many, in case of a wipe you will probably have to drag them to a safe spot because rog hide/sneak is the best invis in game. Raids is basically the same you dps, you drag corpses when bad things happen
Monks are also great dps though I think it would be harder than a rogue for a starting player, having to pull for a group if youve never experienced the zones could be a challenge and when your on a server of veterans some people may not have a lot of patience. Monks are much better soloers and with mend/fd you can go a lot farther in levels in terms of solo. In groups monks pull mobs for the group to kill so you will be very active running in and out tagging a monster and bringing it back can be a lot of fun for the right person, on raids your pulling/dragging/training
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Enchanter is going to be the most difficult for a starting player, they are difficult anyway. Enchanters can do pretty much everything you want. you can solo 1-60 and you would be the best class at camping mobs for items, enchanters can invis they can lockdown mobs so they cant attack or move they can charm mobs to fight for them they do damage damage over time they buff they get lots of fun illusion spells. In groups youll keep everyone buffed and keep mobs mezzed. if your puller gets to many or you have bad luck with repops youll need to lock those mobs down so they dont kill your group, if the situation is cool you do damage, nuking with spells or charming monsters whatever you can do.
Really depends on what you want to do, if you want to just kill stuff go rog if you want to kill but bring a little more to the table and have some survivability go monk. If you want the option to do anything anytime go enchanter.