To make yourself creative on minecraft, simple type "/gamemode creative" (excluding parenthesis) and to go back to survival, type "/gamemode survival" - pretty simple. If you wish to make somebody else creative, type "/gamemode (username) creative" and this should put them in creative. For example, "/gamemode MinecraftPlayer creative" - in case you don't get it.
Make sure you are an OP, as an additional note. To OP yourself, go on the server console and type in "op (your username)" without the / this time (the console won't recognize it!)
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You have to be the host of the server.
If its not your server you can not, the server owner only can. If you have your own server, go into the console of the server and type in /op YourMinecraftUsername
Why would you make a minecraft server to play on it urself? It wastes RAM and time.
It does not cost anything to get a minecraft server. You simply download the Minecraft_server.exe from the minecraft website download page. Then, you run it to make your own server.
In server.properties Edit The "motd= Server" And Make It Whatever You Want