Heya,
I would check out some reviews on different strains. Typically a sativa or sativa-dom hybrid will give you more creativity and motivation. Albeit everyone is different, in my case pure sativa's actually give me anxiety so I opt for more of a hybrid. Some famous sativa dom strains would be haze strain, Blue Dream or a Jack Herer. Another thing you could look into is the different cannabinoids in each strain as some are known to give different therapeutic effects than others.
Cheers and good luck!