Hi @Dark_Olena pleased to meet you. I have a support co-ordinator funded in my plan (level 2 in the NDIS page linked above by @TideisTurning ) and they've been invaluable to me. When I got my first plan I was allocated one from a major organisation that I wasn't a good fit with and it took some time for me to realise (with help from our local disability alliance of pwd peers) that I had the right to 'choice and control' about who my support co-ordinator was. So I found a new one. He is a sole-trader and has been excellent in helping link me to activities, work out how things are to be funded (from which part of my plan), advise my plan manager about what's doable, and even helped me do a public housing application. Basically their job is to help facilitate whatever is needed for you/ your child to participate in something, and to come up with ideas of activities/services that might be helpful for you to work towards your goals in your plan. I looked for someone who had some education as well as experience and feel I got lucky. On the NDIS website there's a list of service providers and you could ring around a few support coordinators to ask what they do. I think this is the page you want for the right link for where you are :
https://www.ndis.gov.au/participants/working-providers/find-registered-provider
You could also just google NDIS support coordinators in your area.
But you do need to have funds for support coordination included in your plan.
Hope this is helpful.
EDIT : my support coordinator will also write a support letter about progress/obstacles to working towards my goals and attend my planning meeting with me.