I'm creating an Investment policy statement and need help!

Can I have calculation steps on how to:

refinance a house that's worth 200,000 with a 150,000 mortgage

create a 529 plan for 2 sets of twins aged 9 and 3 by rolling over one beneficiary to the other when the first set of twins reach college end

create an individual 401k

how to apply inflation and interest for a time horizon of 35 years

Can you please make a scenario using your own numbers but show me the steps

sell employ texas ldx doney 2 255,000 500,000 3 35 years ? 4 income time horizon after responsibilities self employment tax 5 15.30% IRA refinanced house housing worth 2015 mortgage expected inflation rate 6-month emergency fund social security 6 200.000 150,000 3.00% 43673.5 45328 7 8 9 after tax 10 11 12 13 13,000 14,448 3429 680 14 15 16 yearly responsibilities Food mortgage homeowner insurance car insurance health insurance utility miscellanous Car payment ira total 17 18 11404 1542 30,000 5844 7.000 87,347 19 20 21 22 23 final year income 24 sell employ texas ldx doney 2 255,000 500,000 3 35 years ? 4 income time horizon after responsibilities self employment tax 5 15.30% IRA refinanced house housing worth 2015 mortgage expected inflation rate 6-month emergency fund social security 6 200.000 150,000 3.00% 43673.5 45328 7 8 9 after tax 10 11 12 13 13,000 14,448 3429 680 14 15 16 yearly responsibilities Food mortgage homeowner insurance car insurance health insurance utility miscellanous Car payment ira total 17 18 11404 1542 30,000 5844 7.000 87,347 19 20 21 22 23 final year income 24