I love hearing about when people enjoy writing. It is such a rush when the words start to come.
I like both long and short stories, but there is always a little trepidation when I start reading an ongoing work, because I am afraid that the writer will stop updating and just leave me hanging. Luckily, I don't find that happening too often on this site. But waiting for updates does drive me crazy sometimes
I'm not a seasoned veteran either, but I do like to write. I know that I would never post a long story until I have it complete. I made a mistake one time of posting something before I had the ending worked out and it was miserable trying to finish it. Some people find that having chapters posted help motivate them to write, for me it is the complete opposite. If I feel pressured to write because people are waiting for updates, then it feels like an obligation and sucks the fun out of it. If it's not fun to write, then that is when it gets really hard.
I usually have a vague idea of how a story is going to end and even less of an idea of how to get there, but if it is a short story, I'll dive in with no more of an idea then that. It makes it fun if I don't know how exactly things will happen and decide to figure it out on the way. Usually I just let my characters figure it out. They know what they are doing better than I do!
If it is a long story, I will sometimes use a basic outline, just to help keep me on track and help me make sure I don't wander into a gaping plot hole or such, but I always try to make sure I never have everything 100% planned out. Where's the fun in that?
The only time I've come across blocks have been one of two reasons. Either I had been hammering away at the story too long and needed to take a break. When that happens, I will usually tinker with some other story, and then come back to it. The other reason is usually because I am trying to make my characters do something that they don't like. I remember a point in a story line where my character was supposed to start doing something that was completely against his nature and no matter what I tried, I couldn't get it to work and was just stuck. Then one morning, I was sitting in my car before going into work, which was where I would normally write down pieces of the story that I thought up during the drive into town. I was pissed off, because I had been hammering my head against that scene for weeks and was fuming (not a good state to be in when I was going to be facing patients in 15 minutes ). And then it just came to me, out of the blue, that I was taking the story in the wrong direction. I knew that, but I had been ignoring it because it would mean going back and deleting or revising over 10,000 words of writing I already had down. I might have hit my head against the steering wheel in frustration, I can't remember. But when I went back and made the necessary changes and let the plot follow it's natural course, the words came back. Incredible.
Anyhow, that is my strange little advice. I don't know it is is helpful, but I know it works for me (but I am a weirdo.) Good luck with your writing.