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This is true, you need to tone down disc speed in the beginning. If you can't throw the disc straight for a solid 220'-250', you need less speed. Some discs are meant more for hyzer, and annhyzer shots, but for a newer player a good rule of thumb is to find a disc you can throw with as little hyzer as possible. (Less Fade) then incorporate faster discs for specific throws. Find your throw, then find a good disc that matches it.
Good Discs for Gapers (Newbs)
Almost any mid-range will do you pretty solid. Don't worry about what kind of San Marino Roc you have, that won't mean crap for now. There mostly for geeky collectors (like myself) any way. Avoid the Roc3's and such these are tough mids to throw.
Any DX plastic for about 6 months
For flickers, find a driver with a speed around 9 or 10 and you'll be set for a while