Like Ganef said, think critically before posting. If you have something of value to add like experience dealing with the subject then your good, if you are asking a legit question about the topic that you really want to know then your good.
Some members on here like to go out of their way to point out a necro post just because of dates are not close, as long as your post is relevant then don't worry, they just have to much time on their hands. I rather have you continue on a old post then start a whole new post. That way when you do a search you can find info in few posts then getting a bunch of crap pulled up.
Just avoid making commentary posts like "that is so cool" or "I want one of those"
For those that like to correct others for reviving a post when they are being legitimate about it, adding knowledge or asking further questions, get past it, I promise you will be able to manage.