Could be nute burn. Yes the affected leaves look dead, cuttem off. No they will not affect the rest of the plant, if you have nute burn you will start to see that look spreading through the rest of the plant. Run off is good, we aim for ten percent runoff. This leaches fertilizer from the rootzone so it doesnt build up. Build up is bad so runoff is good. Also, fertilizer doesnt grow plants, dirt does. Lots of people do this at first, feed like crazy. Simce you dont know what your dirt is id guess some low quality potting soil. Which is good because you wont have to fertilize much. When you water wait until the container is light in your hand and when you puch your finger into it you can tell its dry, you want a wet dry cycle not wet all the time, ever.
