Hi Kane,
This is a very challenging question, because there are so many different components to the type of learning difficulty the students may manifest. There are 6 major areas of learning disability with the two most common being dyslexia (reading-language processing deficiencies) and dyscalculia (numeric processing deficiencies). The first step is to identify the exact processing difficulties the student has and what supports have been given previously. If the student had an IEP in high school, there will be a complete listing of supports and helps that were given during the high school years. The student can either secure a copy of the IEP or give permission for you to contact the school and get this information. I use this method all the time, since it saves time and I don't to reinvent the wheel to discover what support I can give the student.
Examples of supports or helps, might be longer test time, notetakers, recorded lectures, etc. My experience in working with LD students, is through the use of white space between paragraphs, drawing boxes around important information, and giving practice examples prior to doing the work really helps them. In addition, there are a number of assessments you can administer to assess the student's reading or math ability.
If you have a particular situation in mind I will be glad to share this information with you.
You need to be aware of the type and kind of medication the student is taking as well. The most common is Ritalin or Adderall. These medicines have certain side effects that may dictate how the student reacts during certain times of the day or evening.
As adults, ADD and/or LD individuals will typically have developed coping strategies that enable them to function in society. Set down in a interview session and simply ask what needs to students have and how can you best meet their needs. I believe you will find that they can give you a very clear picture of what their support needs are. The most common things will involve adapting and modifying the delivery process.
One thing to make sure with students with ADD is that they have been diagnoses as having ADD/ADHD by a medical professional. We are constantly having students claim they have ADD/ADHD because they don't want to set through the class or attend to the course requirements. Once you know for sure they have been diagnosed you can proceed with your accommodation of their learning needs. With this group a key factor is the elimination of distractions as much as is possible. Individuals with ADD tend to be withdrawn and not to engage in the learning process, while the person with ADHD will be distracted easily and bounce around a lot. Short instructional sessions with breaks will aid them greatly.
Hope this gives you an overall picture of what these students are facing as they enter the classroom. If you have any further questions please let me know.
Gary