To begin my career in the medical profession by starting with this entry level position. Or something similar to that like "To obtain an entry level position in the medical profession. Go to your local library and look at examples in the careers section.
Writing a objective is an important section of resume.It depends on job position and your field.
for e.g if your are applying for a job in It industry then you can write as follow:-
To pursue career in software development and obtain successful position by using my skills.