Are official site and Wiki not enough for you?
They have English pages.
At least you can get pictures of their equipments on their official.
For example,you can print out the picture of their uniform and so on.
防衛省・陸上自衛隊｜装備｜需品器材
防衛省・陸上自衛隊｜装備｜火器・弾薬
I could find some forums easily.But all in Japanese.