Good sites on etymology, grammar etc.

Hello again!
My conlangs starts to form from my ideas now. A couple of months ago i
mentioned that I had the language teinvard (the proper name would now be
anvarte), and it has developed more and more, and I've learnt more and more.
I'm still not more than a newbie amateur linguist :-)
I've used internet to a large extent when trying to learn more about the
subject, but it's hard to find the good fruits in the internet jungle. Do
you have any good links to sites where I can read more on etymology, grammar
(not for a specific language, more a genereal approach) and semantics. I
need to now more on how to create a lexicon (not just lining up the words),
more on morphology, etc. I always need to know more, of course :-) And it
would be great if some of the sites were made for conlangers, so I learn
morw hoe to construct my language, rather than learing more lingustics. But
maybe I have to know much lingustics before I could construct a conlang.

Happy Continuation ("Glad fortsättning" in swedish :-))

/Martin