An inspector would have disclosed all or most of the defects you listed. Shame on your realty agent for not recommending such an inspection. However, if such a disclosure form was provided and if the seller and real-estate broker lied about the defects, then your legal task is proving they knew about the problems but concealed them. Concealing known home defects is fraud. Ask your neighbors if they knew about any of the defects.
Neighbors are often great information sources and trial witnesses.
Also, the Federal Housing Administration appraiser should have disclosed any obvious defects. However, your FHA mortgage lender has no liability to you for the repairs. I usually suggest phoning the local association of Realtors to get the name of its lawyer, who often will recommend local legal specialists. But the association's lawyer might have a loyalty to the broker involved. The local bar association lawyer referral office also should be able to refer you to several local attorneys who specialize in cases like yours.