Conditional formatting - various rules in one cell

Hi - Please find attached my sample.

This is basically a variety of steps - required timescales (SLA's) and action completed dates. hopefully you can follow it. Point 1 is definitely a conditional formatting but im not sure if anyone can help me with point 2 & 3 here also? I am aware that these are What if functions but I don't want to post this twice and contravene rules.

to be formatted in all the columns which are (received)

Point 1)
**if 2a [J2] is before 2a [I2] the highlight green as per sample.
**if 2a [J3] is later than 2a [I3+7days] the highlight red as per sample.
**if 2a [J4] is later than 2a [I4] but before [I4+7days] the highlight amber as per sample.

Point 2)
Column M - if using the rules above the Timescale has been met or not with [yes/no/nearly] using an IF function? this will enable me to run pivot table at a later date (which I know how to do)

Point 3)
4a - date needs to populate as the later of 1) 2b - received [K] or 2) Step 7 [Z]

Thanks for your help!!