You can watch my video here for info on F&F for info:
You have to put your offer in writing to your IP and ask them to call a variation meeting of creditors to vote on it. (You will need 75% in value of creditors who vote
to vote in favour of it)
Send them the evidence that the funds are coming from your parents, as a gift. (i.e a copy of their bank statement to prove the funds are in their bank account and are not coming from your own assets that you have hidden)
Your IP may also want to see certified identification from your parents for money laundering purposes.
Make sure you word your letter to say that any contributions you pay into the IVA in the meantime whilst the offer is voted on by creditors will be deducted from the lump sum being paid over, if accepted.
Assuming everything continues in the normal way, there are no other assets to realise and there is no property extension to be dealt with it seems that you have c£9k of contributions to make.
The closer the offer is to that figure, the more attractive it is to creditors and more likely to accept, but also bear in mind the potential savings on administration etc in finishing the IVA early (although counter that with a presumed standard variation fee often charged by some IPS at £500)
An offer of maybe £6-7k may do it.