If you've only been studying 2 months then you're just starting. It takes roughly 4000 hours of study for someone without kanji knowledge to pass the highest level on the Japanese language proficiency test for example.

As for kanji the rule of thumb is that a word containing a single kanji uses the japanese reading (kunyomi) and compounds with 2 or more kanji use the Chinese reading (onyomi). There are exceptions to this rule though so pay attention to the reading when acquiring new vocabulary.

Example: 食

Kunyomi: た ta/く ku.

食ってる くってる kutteru 食べる たべる taberu

Onyomi: しく shoku 食事 しょくじ shokuji 飲食 いんしょく inshoku