As someone with one of the more successful templates on the marketplace my advice would be to think about how you want to approach this carefully before you drop anything to the marketplace. Whilst the suggestion to sell just some components is a good one, as it allows you to not stress so much about making your own project stand out from the ‘template’ you sell, that will, inevitably, make you less money, as (in my experience) people are much more likely to be won over by a complete template than the same bits and pieces of the template sold separately (even if they cost the same). It also comes down to what you need, financially, from the work. If you aren’t in too much need of money, then I would just sell some choice bits of your template - look on the marketplace, find some stuff that isn’t covered that your work does, or at the very least that your work does better, and pull them out as drag-and-drop components/features and sell them. That will get you some money coming in, but you will still have your main project as a very unique setup. However, if you are looking to break into the marketplace for financial reasons, then the entire template is definitely the way to go IMO. Just be aware that you will get a LOT of support requests from a template. I now have 6 products on the marketplace, and I get more questions about my template than I do about all other 5 combined, however I also get more sales of the template than all other 5 combined… well almost anyways haha.
Also be aware that, if you haven’t submitted to the marketplace before, you’re in for a lot of frustration and “WTF?!” moments when you go through the review process and they hit you with something stupid like “This float + float node isn’t commented… everything needs a comment” or “You have two blueprint noodles crossing. So we insta-failed you for this” lol. Submission can be a real drag if you get unlucky with it!
Project looks awesome and I look forward to seeing where it goes 
Hope you don’t mind the above advice - you asked for advice in the thread title so figured I’d try and help 
I don’t think I’m a master of the marketplace or anything, but I do use it as my sole income so I have a little experience haha.
Edit - also, more than happy to chat with you via skype/discord/hangouts/steam if you have any specific questions about marketplace stuff I’m always happy to help out if I can haha