Do I have a chance at winning appeal based on ineffective assistance of counsel, and numerous other errors in the trial?

The following is based on general principles of law, as I do not specifically practice in your jurisdiction.

In general, appeals are based on errors in the procedure of the trial, not an opportunity to re-argue the facts.

First - before you worry about an appeal, you (and presumably your new attorney) should discuss a motion for a new trial. That must occur before sentencing. If you've already been sentenced, then you must file a notice of appeal in a timely fashion (for example, in CA, it must be filed within 60 days).

From there, the appeal will look at procedural irregularities and may include your claim of ineffective assistance of counsel. There's just too much case-specific information that can't be covered here. You'll need an in-person consultation with a criminal defense attorney that specializes in appellate work.

Good luck.

Without commenting on your specific complaint ineffective assistance of counsel is usually a losing argument. Anyone can second guess what trial counsel did. Moreover most of the time he will have had a strategy in mind even if it didn't work. That is not ineffective assistance of counsel. You have to have something more--sleeping during the trial, drunk in court, and you have to be prejudiced by it. If your guilt is clear despite your counsel's errors you better find another argument.