Hello Jen,
M-ABC2 is great to use for gross and fine motor assessment or individual components. Quick, easy to administer and to travel with and standardised with Z-scores / percentiles. Sensory Profile2 has online access and covers the whole spectrum from babies to adults (you allocate the appropriate questionnaire to the client). I use Ayres' Clinical Observations standard with all my assessments too as it helps identify possible underlying issues. Further training in Ayres Sensory Integration and the use of the SIPT has also been extremely valuable to understand the proven neurophysiological components influencing the areas you mentioned you are working in.
There are a wide variety of websites, blogs etc. with ideas and resources for therapy. The best one for me with regards to research and training (webinars and on-site attendance) and treatment is the Spiral Foundation
http://thespiralfoundation.org/ Then you also have Tina Champagne
http://www.ot-innovations.com/ with a huge amount or resources and Angie Voss
https://au.pinterest.com/asensorylife/ for everyday, common-sense explanations and ideas for parents re sensory issues.
Other good resources include Your Therapy Source
https://www.yourtherapysource.com/ and Pathways
https://pathways.org/ - and many, many more...!
Don't re-invent the wheel - find and tap into established resources! It is so worth the while to pay for good training, membership, resources etc. - there is a reason it is not always free π
Enjoy exploring and building your knowledge in this field - it is complex but super rewarding.
Esme
https://www.facebook.com/OTBunbury/