I would say the biggest thing to know is DC whose parents know the system and can advocate for them get better support. It shouldn’t be this way, but it isn’t going to change in the foreseeable future. With that in mind, it can help to read IPSEA and SOSSEN’s websites and the SENCOP to begin to understand the system and the law rather than unlawful policies LAs often have that are perpetuated by some schools.
Not all areas commission sensory OT on the NHS. Those whose ICB doesn’t and who don’t have an EHCP (which can include such provision even if their ICB doesn’t offer it via the NHS) would need to go private (or go down the EHCP route). If you look for an independent OT, make sure they have experience/training/qualifications in sensory integration. Not all do. If there is the potential you will request an EHCP, make sure they have SENDIST experience too.
For sensory needs, some people find the book the Out of Sync Child helpful. Depending on age/needs, you may also find this booklet, this website and the Occuplaytional therapist useful.
Sensory toys/equipment can help.
What support is the school providing?
OT and SALT can also help with emotional regulation and social communication. The school can also support this. For example, by Zones of Regulation, nurture groups, Lego therapy, drawing and talking interventions… For some, part of emotional regulation difficulties is the coke bottle effect. Where DC appear to be ‘fine’ at school (they aren’t really) and explode at home. If that applies to you, more support in school can improve home life. Some find the book The Explosive Child helpful.