For the logs you need to SSH into the server. They are placed in the following location:
MineOS system log:
/var/logs/mineos.log
Minecraft server logs:
/var/games/minecraft/servers/Servername/logs/latest.log
Minecraft Pocketmine-style server logs:
/var/games/minecraft/servers/Servername/Server.log
FTB (Feed The Beast) type servers are notoriously fickly to set up. Here is @hexparrot’s post on the topic: Install FTB Infinity 1.7 server for noobs
Pocketmine type servers (as Imagicalmine is one of) needs PHP to run. The current available PHP-profiles in the WebUI is to old, so you have to download a newer version manually to your server, and extract them in the correct location. You can find the latest PHP binaries here: https://bintray.com/pocketmine/PocketMine/Unix-PHP-Binaries/view#files
A warning about pocketmine:
For Minecraft Pocket Edition there exists no official Mojang Server software. This means that each time Mojang updates their client your server is very likely to get outdated. And since the Pocket Edition clients cannot be (easily) downgraded again, you need to upgrade the server. There most likely will not be an available server through the WebUI profile system, so you have to find the phar file manually, and install it manually.
If you are new to minecraft and servers I would reccommend you to use vanilla untill you start getting experience. After that I would upgrade to Bukkit /spigot, since these servers do not need a modified client, and can be upgraded to by simply using a new .jar.
You also need to know linux commands. There is absolutely no way out of that. If ou are new to linux you can find a great tutorial here: http://www.ee.surrey.ac.uk/Teaching/Unix/