If you feel your current school isn't meeting your needs, you have every right to request a transfer to one that will. So yes, it would be proper.
No. School district is not a proper and should only be capitalized when placed at the beginning of a sentence, such as this one.
Some school districts will allow an inter-district transfer. Some will not. You need to check with the district in which you reside.
Some school districts have an open enrollment policy and others do not. It has to do with how many tax dollars the school district will receive from the state per student each year. Check with both districts, the one you want to transfer out of and the one you want to transfer into.
Schools have varying rules about whether or not you can enroll a child in another school district if one suspends him or her. Depending on why your child was suspended from the first school district, you may be able to enroll your child in another district if the new school agrees to accept him or her.
If it deals with a location of where you are living in the school district the school district will ask you to go to the school whose district where you live. You can put in for an inter district transfer to the school you want to go to, but if you lie about your address it is very likely the school will find out. If you get into trouble at school that will become a factor if you get to stay or not. If you are asking about a US residency qualification there isn't one.
can my son play varsity baseball he is in a school not in his living area
No, he or she would need parental or guardian permission and permission from the administrator/supervisor of the school district.
You've got to call the school you are trying to attend and then they'll tell you what you need to do, most of the time they will not provide transport though so you'd need to find your own way there. Most schools require an inter district transfer. This is a formal form that is filled out. You need an address in the district that you transfer to and to have a good reason to move. You can't move just because your BFF is going to that school. Call the school office of your home school and they will tell you what you need.
You must fill out the state required notification of enrollment form for a charter or cyber school that is certified and recognized by your district and state.
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Your legal guardians are responsible for your education. They can enroll you in a private school, provide you with a tutor, home school you, or insist that you change school districts without giving any cause. The school district itself has the option of rejecting your transfer if you do not live within their boundaries. Schools rarely reject transfer applications unless they are already at capacity. My own parents had me transferred from one school to another when I was in the sixth grade. I had both my daughters transferred from one school district to another, twice while they were growing up. All we told the school district was that it was more convenient for us.
Annandale High School is in the Fairfax County Public School district, so no. Public schools get a lot of their money from taxes, so someone living outside of the district would essentially be stealing their education by attending school there.