Texas law gives an individual the right to appeal his conviction unless he expressly waives it or accepts a plea bargain agreement. The appellate process is strictly governed by rules and deadlines that MUST be followed or the appeal will be thrown out. I highly recommend hiring competent counsel ASAP to make sure that he gets every opportunity available.
Any time your attorney asks a question, you should answer it honestly. Information you share with your attorney is privileged and as such, can't be shared or used against you. Every attorney gathers information differently, so what you may say to one, another might not want to know.
Bottom line, you tell your attorney the truth. If you lie to your attorney, it will not work well for you.
Because the consequences of a conviction can reach far beyond the "how much time am I going to do", I would NEVER recommend representing yourself in a criminal matter. A competent defense attorney will be able to not only work the case properly, but guide you through the process. If you don't know what you're doing, you can invite disaster.
A 3d degree felony carries 2 - 10 years in prison and an optional fine up to $10,000. And he'll likely be facing revocation on his probation.
The bond seems excessive. You should hire counsel ASAP to work the case.
The amount of the drug indeed does determine the available range of punishment. The intent to deliver is determined by a number of different factors. The amount, the packaging, the observed behavior of the accused are just some of the things the State uses to determine the intent to deliver.