Nervous about first deal. Need help

[Mitchell Miracle]

I am nervous about my first deal and need some advice. I want to buy and hold a triplex in florida.  Here are the details:  Three units.  One 3/2 and two 2/1.

$245,000 price.  25% down.  $3000 closing costs.  4.5 % financing with .5 points and 20 year amorization.  Taxes $2400.  Insurance  $900.  Rents $2650 (all units) monthly.  I plan on self managing.  Building passed inspection with no issues  and is fully leased currently (new roof, new septic, new a/c).   If I figure 10% vacancy and 10% expenses I get the following:

CAP 9.14% COC 12.98%. Debt ratio 1.6.

Any advice would help.  Thanks