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Most modern web browsers are giant beasts, and probably fairly poorly designed because they (and the web itself) evolved in a rather haphazard way.
You need to start by first making the goals of your project (and what you hope to achieve) very explicit. Is this something you're just doing for fun, or do you expect other people to use your browser? If you expect others to use it, what will the incentive for them be? It is unrealistic to expect that you will develop a new browser from scratch that everyone will be able to use as a replacement for Chrome, Safari, Firefox, IE, Opera, etc. All of those projects have a 10-15 year head start on you, and by the time you've caught up to them, they will be another 10-15 years ahead of you. Plus they have a lot more man power behind them, and so if you want your project to be successful, you will need that man power at some point.
This is the reason that Apple and Google, big companies with lots of resources, did not start from scratch. Not even Microsoft started from scratch. The original IE was based on Mosaic. The only significant browsers still around today that were started from scratch are Opera, Konqueror and Lynx, which unfortunately all have minuscule market share. Let's forget about Lynx for the moment, since it's a text-only browser and presumably the only reason it's still around is because it serves that specific niche. Opera is arguably one of the best browsers ever made, and yet it's never had a great market share, so remember that success and innovation are not the same thing. KHTML is the engine behind Konqueror, which never itself became very successful, but is the basis of WebKit that both Apple and Google use. I think one could definitely argue that if KHTML had never been made, neither Safari or Chrome would exist. Interestingly enough, both KHTML and Opera were largely produced by Norwegian programmers working in the sa