Hi Starflare, welcome to the forums!

Your story sounds similar to mine; I had these recurring nightmares when I was a little kid and ended up using lucid dreams to get rid of them (before I knew what they were) and then rediscovered it when I joined this forum.

As for your questions, if you want to try WILD first, you're right in pairing it with WBTB, but typically somewhere between 4-6 hours after you fall asleep. The goal for this is to wake up right before a REM sleep period (when you have dreams) as opposed to a deeper sleep (dreams are uncommon to have in this phase). It takes a little bit of trial and error to find this, but it's well worth it when you do. 3 hours sounds a bit too early, though. I'd stick with 4 or 4.5. Just know what WILD is a bit trickier than some other techniques, so it may take more time, but it is one of the more reliable methods you can perform.

As for trying out different techniques at once, it's not necessarily a bad idea, but don't go mixing too many. For example, WBTB/WILD along with just regular DILD (dream initiated lucid dream) are just fine, but don't try and mix WILD with FILD (finger initiated lucid dream) since one is a subtype of the other. Once you get used to one or two techniques, feel free to branch out and try others, but don't go changing techniques every few days. It can take a few weeks to really see the effects of some techniques, so you can't discount any technique after just a few nights.

Other than that, reading around the forum and the tutorials posted are great ways to get ideas for your LDs as well as expand your horizons in terms of induction techniques. If you have any more questions, feel free to ask!