Sweet Six Teen

Iam having a sweet six teen preety soon i dont no what to do do i need a seritn dress. Do i need people to stand up with me
Could i have people stand up with me what should i do iam going to also have it a t the elks in alma and iam going to have mexican food what should theme be iam having it in march or april not shure wich but help me i dont know what to do.??????????????????? love help less