Tips for new/inexperienced roleplayers:
1. When creating a topic, don't be careless. Don't create tons of random topics and ditch them.
2. At the beginning before you make your first roleplay post, you may want to make an introduction post. The introduction can explain the plot, characters positions that need to be filled, rules that you want everyone to follow (for example: no mythical creatures or magical powers), or anything else you want people interested in joining your roleplay to know.
3. On your first roleplay post, you may not want to do a character description. Many people prefer just explaining characters looks and personality within your post so that it flows naturally like a book does.
4. Try to use full sentences and at least a paragraph of writing in each post. Don't stress though. A few misspelled words, or a short post every once in awhile isn't a problem. Just practice to get better.