Overall Bonhams is a wonderful company to work for if you have a passion for fine art, and antiques.The staff is extremely knowledgeable and dedicated to the preservation of art and sharing their expertise with the general public.
In regards to salary, if you are not a specialist, you will most likely need to be promoted to an advanced position to obtain a salary worthy of your title. This is very possible, if you are willing to learn and prove your self. For the most part you might need a second job to supplement your income for a while.
The training is available, however you need to seek it, it is not freely given.