ok not sure what stage you’re at exactly. how much of the script is done? is it an ongoing comic or do you have an ending in mind. this is important because in my opinion you can’t have the legendary storytelling without a good beginning middle end story arc structure and if its ongoing you’ve generally got to have a story arc competed every couple of issues or so. but with the ending in mind your story can take on more “epic” proportions
do you have character designs and model sheets completed? model sheets are highly recommended especially with super detailed characters. it will take a lot of the headache out of your work.
as for style, that will be more or less up to you. which ever one is is superior, is pretty much subjective but as a comment on both industries on either side of the pacific, north america is a place where in order to break into the comic scene you need at least a few years of formal training and several years of practice preceding it. this pretty much forces the industry to be a lot smaller but with a higher percentage of quality work. in japan on the other hand anyone who cares to take a dump on a piece of paper can get it published. they’ll just market it as a “gag manga”. that’s not to say that japan only has bad comics to offer. there are eisners on both side of the pacific. The Bhudda by Osamu tezuka and Blade of the Immortal by Hiroaki Samura are but a couple of prime examples on the japanese side. what im saying is that you just have to sift through a lot, and i mean A LOT of tripe in order to get to the good stuff
but speaking strictly about the good material out there, the principles followed are all basically the same except for the fact that the japanese have more freedom in how they lead the eye across the page. by north american standards the japanese way can seem more erratic and confusing at times but remember the japanese can write both horizontally and vertically
and lastly the comparison of the art styles, is that the japanese often write and draw their comics in monthy installments often with only a single extra man on their team. this results in the need for simpler character designs and layouts, whereas in north america, teams of ofter 5 or more usually highly trained people come together to make a comic often dividing the penciling and inking and coloring among three different people, allowing for more time to draw details and still make deadlines, and this is key. how much work are you willing to put in until the deadline approaches?
man i love all forms of sequential art