Node questions

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self.Bitcoin
I am looking into running my own node and have a few questions. I've done some DD, but I can't find clear answers on these questions. 1. If all I want to do is broadcast my own transaction, do I need to download the entire block chain? 2. Can I turn off my node and leave it dormant for days or months, and then turn it on to broadcast my own transaction? 3. Is it unsafe to run a node on my PC? Is it safest to run it on a dedicated computer? 4. The monthly/yearly energy cost of running a node deters me. Are there ways to mitigate this? Thank you in advance for responding and helping me learn. Messages sent to my DM will be deleted and user ignored.