The 162 is a nice first formula board
If you buy a new board, you will be happy with a Starboard Formula 162. If you want a secondhand board, both 160 and 161 will serve you well. For someone your size, a 10 meter sail fits fine for starting out with Formula. Later on you may want a 12.0 for light wind days.
If you importer or shop has them, a "HD mast impact protector", shown in the Accessories section of the Starboard website, could save you from having to repair the nose of the board. Set the rear straps a little wide, that will make it easier to get into and stay in the straps going downwind. Good luck on starting with formula!