Welcome to the forum!
This is why our rule #1 is "Clear, specific thread titles." Please updated your thread with a title that more accurately reflects your need: "assistance needed" describes 99%+ of threads around here, so it doesn't really tell anyone anything.
As for your issues:
1) Excel handles time as a serial code from 0.00 at midnight around the clock to something like 0.99 at 11:59 PM. (Since dates are integers from Jan 1, 1900, this is so a date/time value can be expressed as a single number, nnn.nnn or so).
So your problem, as such, is that the formula is going to asses "8.5" as something like eight and a half
days, not as 8 and a half
hours.
That will turn the 8.5 into 8h 30m and add it to the start time.
2) Break times is a simple INDEX(MATCH) (or VLOOKUP) off the table of information.
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