You cannot just instruct anyone to attend court on your behalf. You should attend or a lawyer.
You can request that the matter is heard without you 7 days before the hearing, but it is best you attend.
Depending on how busy your court is, I would not expect a hearing for at best 6 months and sometimes over a year from when you file your N1. I would file and when you receive your allocation questionnaire just say when you will be available.
When you fill in the N1 there is an address for sending documents to (for solicitors use generally) but there is no reason why you cannot put an address in there from someone that can forward documents to you.
Anyone sending an N1 form unsealed usually demonstrates an intention not to file at court, I would not do this. For example
private parking firms and debt collectors do this; both of which are very reluctant to file.