Very well done though I will add on certain things.
Ninja- A ninja is someone who uses his power to achieve his aim, goal, beliefs etc. Ninja mainly contribute to the militia power of a country, some ninja's are considered as rouge ninja, they work as individuals or small societies [Akatsuki] and like any other ninja live to fulfill there aims. Ninja work for many reasons like to serve there to country, earn money, to becaome powerful et.
Chakra- Chakra is form of energy which is produced when one combines both his physical and spiritual energy, physical energy is one's own life energy and one can make improvement's in this field and therefor Ninja train vigorously to improve it, spiritual energy on other hand means mental or spiritual energy.
Some people with high physical energy- Uzumaki and Senju Clan, Kisame.
Some people with high Spiritual energy- Uchiha clan, Yamanaka Clan, Kurama clan.
Ninjutsu- You are very right with this one.but I will add some stuff.
Ninjutsu like you said is basically of 2 type nature transformation and Shape transformation.
Nature transformation- It is nothing but providing your chakra with an specific elemental nature, It stronger than raw and unmolded Chakra, all the basic 5 elements are its example.
Shape transformation- It is providing your chakra with basic shapes just like in case of Rasenga, by doing so one is able to increase its damage dealing properties and as well as defensive properties.
Element's- Nothing to add there for the time being though learn there japnese name they may come handy.
Katon= Fire
Suiton= Water
Doton= Earth
Futon= Wind
Raiton= Lightning.
Elemental Ninjutsu- Ninjutsu used with the 5 basic elements usually known as nature transformation.Nature transformation is one of two necessary techniques for creating a technique. It is an advance form of chakra manipulation or control. It entails the molding and defining of one's chakra into an innate type of chakra nature, giving it different properties and characteristics. Elements is the basis of Ninjutsu. All of the nature have weakness and strengths and this effects the ninjutsu as well for example... A water technique that is C-rank can easily put out a C-rank fire technique and even a B-rank fire technique but it would still lose to a C-rank earth technique. You can even combine elements that go well with each other, for example fire and wind.
Here is the diagram to explain elemental advantage of elements over each other.
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[B]Strong points[/B]
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[B]Weak points[/B]
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[B]Combinations-strategies[/B]
[B]Ways to counter:[/B]
[B] IMG [if you can find one][/B]
[B] Any question [/B]
Well it is not important to combine it with other jutsu only, you can use free form action to come up with a combo.Combinations-strategies
I do not know any other jutsu, so I don't know what to pair it with.
Retriting won't be that easy in free form movements, remember fire is strong against wind so the most logical counter is use fire jutsu but thinking out of the boz is what makes you a good role player.Ways to counter:
Just retraite to mid range or use a stronger jutsu