Hi Beverley, and welcome to WriteWords
Just wanted to second everyone else - I'd suggest getting writing first, and worrying about punctuation later when you've got the story down. Apart from anything else, punctuation is about getting your prose to say what you want it to say, and it's easier to do that once you do know what you want to say!
When you do get to that stage, there are two issues with punctuation. The easy one is about the conventions of correct punctuation: how you punctuate dialogue, what you do with lists and clauses within a sentence, how to avoid comma splices and so on. I've had the Penguin Guide to Punctuation recommended to me: I haven't looked at it yet but Penguin's other reference books are usually very good, so I'm sure that would be.
The subtler issue is about learning how to use punctuation so that it helps your sentences to say what you want them to, how you want them to. That is about understanding convention - because that's where your readers will be starting - but also about understanding what effect each punctuation mark has. Reading aloud really helps, because you can often hear the shape and sense of a sentence that way when, if this stuff doesn't come naturally, you can't really see it on the page.
And, to be honest, I wouldn't recommend Strunk and White because it's American, (unless you are American, of course - can't tell from your profile, so am going by your style!) and their conventions in both punctuation and grammar (which of course are closely related) are much more different from ours than you'd imagine. I have regular tussles with my US copy-editor about commas. The hard-core English stuff about punctuation, capitalisation and so on can also be found in New Hart's Rules, which is published by OUP and is the bible for publishers and typesetters.
As to research, it is necessary and sometimes inspiring - how often have you come across something by accident which you weren't looking for, but is absolutely brilliant. But you need to leave it behind. Graham Swift says 'Bugger Research', as Naomi says, Terry Pratchett implies the same, and Rose Tremain only spent two weeks in Denmark to research the whole of
Music and Silence. To get your research to be part of the fabric of the novel as completely as all the elements you already knew and
didn't have to find out, you need to absorb it yourself, before you start putting it on the page, and then write it as naturally as you would all those things you already know. That's not to say that you have to become a computer expert, but that you need to use the facts and ideas you've discovered as lightly as you would, say, the geography of your home town which you're using for the novel, or details about clothes, or the train journey from Stockport to Manchester which you did every day as a child. The gold standard for using research material is just this: which bits would you put in if you knew this stuff naturally, and where and how? Everything else must be left out, even if it cost you three days in a library. Obviously if it's an unfamiliar subject you need to make sure that the details which are crucial to the plot get sneaked in, but on the whole you may well find you need much less information than you thought you did.
You may also find, as Naomi and SusieAngela also suggest, that you don't need to have all your research marshalled before you start. FWIW, and I think many other writers are like this too, I only do the basic research that I need to make sure my plot will work, then I write the first draft, collecitng a long, long list of things to find out, and incorporate them into the second. That way I know what I need, and often I find gems I didn't know I was looking for along the way and rejig things in the second and third drafts.
Emma