No, DMV will never give you a CDL unless you complete the DUI classes and obtain an SR22. That is there requirement. Call DMV and confirm what they will require from you. Should you be caught driving without a CDL it will be mandatory jail time.
A DUI with injuries is serious. This is a felony. Who is the injured party? Is your husband represented by counsel? If not make sure that you hire an attorney for him. This sort of case oftentimes are state prison cases depending on the injuries suffered.
Your brother should absolutely be represented by an attorney. You do not list all the felonies. Given what you have listed these are serious felonies. You have indicated they are not offering anything. I would be surprised if your brother does not have a Public Defender. The fact that the DA is not willing to make an offer is an indication of the seriousness of the case. This is not the sort of matter that he should be representing himself on. You also indicate that he is on probation....
You still have time to get an attorney. Interview some attorneys and get yourself good representation before you appear in court for the arraignment. This is not a situation that you should attempt to handle on your own.
You would need to speak with an attorney in Nevada. With regards to your California DUI's if you are no longer on probation you should consult with an attorney to have them expunged. An expungment is a good way to clear your record that should assist you with your employment prospects.
Probation is much stricter when it is formal probation. At this point the illegal search is not relevant-you have already plead guilty. You need to put this case behind you. A failure to report will not be taken lightly. That said, an attorney can present your situation to the court in an attempt to obtain the best resolution for you. You need to resolve this situation sooner than later. The longer you wait the worse it is going to become.