You can take the exams in any order. Most start with the 601 since it's a required exam and contains much of the same material as the electives. You can also schedule the exams however you like. You can take them back to back, a day apart, month, whatever. Check with your local testing center for available dates and times.
Here's a link to the
CompTIA FAQ. Set the category to the appropriate exam and it will provide a list of related questions and answers. Then if you still have more questions, check back again. Be glad to help.