Any cert you can add can definitely be a plus & looks good on a resume.
The A+ focuses on troubleshooting PC problems from many aspects (software, hardware, some limited network problems, printer probs, etc). Go look for some of the practice tests available online, at the COMPTia site
or other places, you'll get an idea of what you'll be quizzed on.
The test will be 90 minutes long with 100 questions to answer. More information here
There are places that have offers of helping you pass the test. They charge for this service. If you want to pay for these, it's your choice.
Other good choices for COMPTia certifications are Network+ & Security+
The only bad thing about these certs is, your certification is only valid for 3 years & then you'll have to re-test. Each test is approximately $250.
Effective January 1, 2011, all new CompTIA A+, CompTIA Network+ and CompTIA Security+ certifications will be valid for three years from the date the candidate becomes certified.
I would advise you to get enrolled at a local college that is also a COMPTia Certified Test site. Being a student there often entitles you to 1/2 price for the tests. If the college is too far away, sign up for a online course, some colleges still consider you a student and eligible for the discount.