Toddler 2.9 years diagnosed - what to do next?

Hi all,

I had a private Autism Assessment for my son a couple of months ago he's now 2 yrs 9 months. 

I started him in Speech Therapy at 18 months It was from beginning this that I decided to get the private assessment. My son has also been seeing an occupational therapist for a couple of months and I've recently just started him at a nursery last week.

I'd really like to ask for any knowledge or advice on what I should be doing in terms of support.

I've sent nursery his assessment which I believe they will then apply to the council for the additional funding and observation of needs - is this the ECHP?

Do I need to inform the doctor's and what else should I be applying for for future support.

I just feel a little overwhelmed of what processes I should be starting from ECHP's to DLA to Early Years SEND. Any advice on where to start would be welcomed.

And any advice on what steps a nursery should be providing in terms of a care plan.