Dawnguard Spells - If you're talking about these spells, it depends. If they are given during the Dawnguard quest-line directly they are unobtainable unless you join the Dawnguard. However, some of them appear to just be located in various spots. I'm not sure if non-Dawnguard players are able to enter those areas or not since I haven't played it yet, but it should be easy enough to figure out if you have access to the locations they're at.Staff Making - You can't currently make custom staffs.Undead Spells - There should be quite a few spells that are good against undead in vanilla Skyrim, such as Turn/Repel Undead and fire spells.