What pack would you suggest to me.
I have collected my gold to 150 with plaing ladder, winning constructed tournaments and betting on them.

So it would probably take some more time when I would get next pack.

Sylvan would be ok, because I don't have any other elemntal cards.
What you say? Is it wise to buy elemental?

Edit: Or from which pack normally gets the most gold, if you sell the cards?

Supposing you're playing with /mixed/ default decks and some phantoms only, I think best option would be to buy few cheap cards, but which will improve your deck a lot, as this can be easily done. Will help to get another 150 gold way more quickly..
Buying some booster would be mostly only waste of the hardly obtained gold, as there is much more not-so-handy rares than those, which you would sell easily. Of course, there's always chance for those, but you need to be really lucky. Buying single needed cards will be safer..
Buying booster as soon as I collected my first 150 gold was my biggest mistake.. so you can believe me as I did this foolish thing =) (But maybe it's because I am not the lucky one, you might be, if you feel courageous enough to do it )

Eh I didn't understand everything. Just for fun I selected purchase pack and I thought I will be able to select domain... So I purchased pack! But I was quite lucky and i got some expensive cards.

You can only choose domain for the pack if you get the packs via Domain Leagues. Otherwise, it's a pack of 15 (1 rare, 3 uncommon, 11 common) out of all possible cards in all domains.

Glad to hear that you got some expensive cards. Lucky!

If you mean my post PM me what, I'll try to explain it bit better
anyway, congratulations to your lucky deck =)