Hi~!^^ In English, はず ≒ will, may, (sure) べき ≒ had better, should, (must) "はず"は、予想(想像)的な意味合いが強く、確実ではないけれどそのように信じている予想的事柄に、 "べき"は、強制(勧誘・提案)的な意味合いが強く、ほぼ確実な現実的事柄に対してよく使います。 "べき"は、他に可能の意味もあります。 Ex.) 彼はここに来る"はず"だ。 He "will" come here.(≒I'm sure he will come here.) 彼はここに来る"べき"だ。He "should" come here. Have a nice weekend!;)

Hi!^^ "必要な" is an adjective to modify noun. (ex. 【必要な】物 = a "necessary" thing) "必要" is a noun/verb/adjective(but doesn't modify noun). (ex1. あなたはそれが【必要】です。 = You "need" it. / It is "necessary" for you.) (ex2. それをする【必要】はない。 = There is no "need" to do it.) Have a nice weekend!;)

Hi!^^ I think the first step is to master hiragana. I suggest you practice writing hiragana, listening to the pronunciation at first. I think the pronunciation of Japanese is simple and not so diffuicult compared with other foreign languages. So you'll master it easily if you study hard. Good luck!;)