It's probably like the other two Naruto RPGs. I doubt it's that much different. I just want to know what the Wifi does.
There is also a WiFi friend code thing, if you like fighting your favorite buddy.
On the title screen the options are;
Continue (if you have a game)
New game
Erase Save (if you have a game)
Wifi Settings (the default wifi setting screen)
Multiplayer (local)
And in the dojo there are different enemies to fight;
Shikamarus Team
Iruka
Mizuki (wearing filler cloathes, but his special is the Mizuki Shuriken from episode 1)
(the list goes on with ???)
Also, there is a survival mode where you fight waves of enemies, and also a event mode, where you play specific matches;
Naruto vs Sasuke
Sakura vs Ino
By the way, all the dojo matches are really hard... much harder then Naruto RPG1/2. Also, you can only save at the healing points, so that would make exploring more difficult too.
To play WiFi mode, you have to visit Anko once you leave konoha (she is top left from the signpost).
There appears to be different rules you can decide when you go online. I think they are level limiters, so you only fight people who are above a certain level. I haven't tried this yet.
Hope this helps
EDIT:Slight basic guide(SPOILERS?)
Basic Walkthru so far;
1) Complete kakashis tutorial
2) Find Tsunade and accept a mission
3) Leave konoha and go right
4) When you reach the torches, press A next to them and then when Jiraya is standing next to them ready, blow into the microphone to breath fire
5) Walk around town and examine everything you can and go back to Jiraya
6) Walk back to town and talk to Tsunade again (The girl will leave and Shikamaru's team will become your allies)