Sounds like you want to learn to spin.
Start with 180s on flat ground first (ie - 180s while riding down a green run). Your main goal should be to be able to 180 in all 4 directions (frontside, backside, switch frontside, switch backside). Once you can do this you can start looking at 360s.
Since freestyle seems to be your goal, I'd also start working on your switch riding as well because if you leave it too late it's going to be a pain to learn switch later.
As already suggested, the Snowboard Addiction videos are great for basic technique demonstrating. Start with the free videos they provide and if you enjoy them there's always the more comprehensive paid versions.
The SA videos do skim over certain areas though, so if you get stuck with a trick feel free to pm me, always happy to help with explaining trick techniques.
I teach snowboarding via step-by-step videos lessons at
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