The instruction books in Heller sailing ship kits are notoriously awful. I'm afraid I can't help with the Heller paint numbers - if indeed they're Heller numbers. I believe Heller used to make its own paints, but I don't think it does any more. If your kit is an old one, though, the instructions may well refer to those obsolete numbers. If so, and if those are the only color references in the kit, you may have a problem.
Nowadays Heller and Airfix are owned by Humbrol, and Heller and Airfix kits generally come with Humbrol paint references. If the numbers on your instructions are in fact Humbrol ones, you can get the names of the colors from any dealer that carries Humbrol paint. I think, for example, they're on the Squadron Mail Order website ( www.squadron.com ).
Somewhere in that instruction book are the colors
named? If so, the translations are pretty straightforward. Black - noir. White - blanc. Red - rouge. Yellow - jaune. Green - vert. Grey - gris. Brown - bruin. Copper - cuivre. Wood - bois. Light - claire. Tan - bois claire. Etc. You might find it worthwhile to pick up a paperback French-English dictionary. They don't cost much, and any decent bookstore should have one.
With regard to the sequence of assembling the hull - either of the options you've described should work fine. It's largely a matter of personal preference. There's plenty of room for personal taste in ship modeling.
One other thought that's relevant as you're starting the model. Give some thought now to how you want to mount the finished product. I don't know what sort of stand comes with that kit. If you like the appearance of it, and it's reasonably sturdy, great. If it's ugly, or too fragile to support the model adequately, you'll want to consider replacing it with a pair of pedestals, or some other mounting method. That will involve putting something inside the hull that can hold screws or bolts - and the time to think about that sort of thing is now.
Good luck. It's a great hobby.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.