Complex java project(for me)

So i have a java project on Battleship to work on and this time i'm supposed to use only loops and if statements. I'm not sure if this is the right place to post this, but i figured any help wld be appreciated. My biggest problem is the design. Rough sketch of what i have so far:

// initialize arrays and variables for the two players

// initialize grids

// ask username, ask PvP or PvC, place pieces(print to grids)

// print grids to move

// get move
get coordinates, shoot(on board or not)
hit or miss(points?)

// switch players
// computer turn
generates coord, shoots, hit or miss(randomize)

// switch players
loop to (print grids to move)

So far, this is what i've ben able to design. Again, i'm not sure if this is the best place to post this thread, but i'll appreciate any and all assistance that cld be offered.