I recommend that you read The 2mm Scale Association's 'Beginner's Guide'. This will give you a good grounding in miniature finescale track construction, whatever standards you use.

But while your at it - go 2mm Finescale! It's much easier to build trackwork to this consistent and proven standard, which will give you better running than any N gauge, and is better looking too.

Anyway, good luck!

Whilst Phil's advice is sound please note you're better off asking questions on the forum rather than in a blog entry - http://www.rmweb.co.uk/community/index.php?/forum/25-modelling-questions-help-and-tips/