I highly recommend reading “Patent It Yourself” by David Pressman especially as you’re not experienced. It’s thorough and easy to read, and you can easily find it online or even in libraries and book stores.
However, getting a patent is quite expensive no matter how small your invention is. Add that to the costs of having a lawyer and the price skyrockets, since you are charged every time you talk to him/her.
If you do decide to get a patent lawyer I still encourage you to read that book, as it will help you make better use of your time with the lawyer and you will understand the whole process much better.