Has prejudice been shown-where defense counsel fails to investigate the credibility of the Defense's expert witness

QUESTION(S) PRESENTED , 1. Has prejudice been shown-where defense counsel fails to investigate the credibility of the Defense's expert witness, _ causing said expert witness to be eliminated as a credible expert witness for the Defense. 2. Has prejudice been shown where the trial court has abused : its discretion and trial counsel has been ineffective in each erroneously misadvising Petitioner that he could not take a direct appeal from his Alford plea to appeal his conviction and sentence. 3. Has prejudice been shown where trial counsel has assured Petitioner that he would be sentenced between a range of . 20 to 25 years for the crimes charged. However, Petitioner was sentneced to a term of life imprisonment. 4. Has prejudice been shown where the trial court erred in failing to advise Petitioner pursuant to Mo. Sup. Ct. R. ; 29.07(b)(4), at the conclusion of final sentencing, of his right to file for post-conviction remedies pursuant to Mo. Sup. Ct. R. 24.035. : i