Hi there!
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You get a free pack every hour until you reach 6. Once you open at least 1, the counter will restart, but you can only have up to six at a time. This encourages you to visit the site multiple times a day to use your free packs.
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Also, value of cards depends on many things. Try reading over the thread below to get you started. There is a marked difference on how many value sets that have a set number of prints per rarity and the new ones that are unlimited for six months at a time, but a set that has a rare with 5,000 cards will not be worth the same as a set with 100.
Welcome, and happy collecting!