@thatyotagirl: PS I made sure it was okay to put a male guppy with a female betta and was reassured it was fine!!

TankRelaxation :

it may be fine, BUT you still have to be careful, all bettas have different personalities and some may be okay with tank mates some may not. HOWEVER you need more guppies and plants to break lines of sight, guppies may not be schooling fish but theyr are shoaling which means they're social and need to interact with their own kind but as I said you'll need lines of sight breaks so they don't harass eachother too much. Good job so far!