if you want a book on middos, there are many options.
1. read mesilas yesharim, orchos tzadikim, etc
2. read the gaavatanic- bad midos pirates series by r’ chait. you may laugh, but believe me it is DEEP.
3. listen to the marvelous midos machine 🙂
ani maamins and har sinai don’t need much explanation in my opinion. but i’m sure you can consult meforshim on maamad har sinai.
happiness- try r’ zelig pliskin’s books. “gateway to happiness” i think.
hatzlacha