I can answer your second question. If I see a quilt I like, I can usually make it without a pattern. If you can print off a copy of the quilt, that's very helpful. I start by drawing lines on the picture, trying to figure out where the repeating blocks are. Keep in mind that many complicated looking patterns are really 2 different blocks that are alternated. Another thing that can make a complex pattern is a pieced sashing. Another thing to try is to turn the picture 45 degrees as some quilts are set on point.
After you locate the blocks, you can get some graph paper and lay it out. Blocks are usually grids of patches: 3X3, 4X4, 5X5 and 7X7 being common. Look for the simplest patches that you recognize, like squares, and HSTs. When the block is sketched out in the grid, you can then look at it and see if you can simplify. Are there 2 HST's that you could combine into a flying geese unit? A couple or 3 squares that can be a rectangle? (Just remember that you have to piece it, so some of these may need to stay simple!)
Once you have the block laid out, you can decide on the size. Let the grid layout help! Don't try and make a 9" block if the block is in a 5X5 grid!
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The more quilts that you analyze & sketch out, the easier it will be.