1) I added Adorabear’s guide on what you get at each # of draft wins, including commons and uncommons, in the LINKS! tab.
2) I think the buying the deck calculations are useful even for new players, on occasion. For example, if you get certain cards or combinations of cards in your deck, it can be worth it to buy the deck at 0 wins (ex: if you get a martyr golem, Agent Coyle Immovable, Klore, or a gold/foil rare).
3) The trade value guide (in the LINKS! tab) mentions some asked for uncommons, and survival swarmer. There are a few more uncommons that are commonly asked for, such as all the swarmers, fear, infested abomination, and uncontrolled rifts, but not that many. Most others should be easy to get.
I think a rare is worth at LEAST 3 uncommons (unless its a terrible rare for 3 fears or something similar). Maybe 5 or more, especially if they aren’t “in demand” uncommons.
I think the biggest problem with posting a value for uncommons is that since they are so much more common than rares, it is much easier for players to get 3 of the uncommons they need than for rates, and so it is harder to trade them for other cards you need.
Two other thing to note:
3A) You may be able to trade a rare (especially a highly valued rare) for a lot of good uncommons from a semi-veteran player (same goes for a gold or foil card), but you won’t be able to trade uncommons for a rare (I would think).
3B) I know many veteran and semi-veteran players give a lot of their unneeded/extra uncommons and commons away to new and/or nice players for free. If you ask in global or trade chat for uncommons or commons, some players will just give them to you.
I personally have given some plat commons/uncommons (as well as non plat cards) to new/nice players for free who asked and I had extras. I gave many more to players who offered a rare. I have also seen new players given a very large number of plat uncommons (and even rares sometimes) for free. However, asking for a free rares, epics, golds or packs in global or trade chat won’t make people want to give you free cards.
4) If you are level 20, and have the double ip bonus from playing for 5 days, you only need 1 win each round to get enough ip to do another draft.