start with monospore isolation that would be easier I think
you can use saline spore solution using detergents or salt solution
there is another way is that you proceed by serial dilution (go to 10 - 4) to tip single conidies then you tip the baby colonies using microscopy or just magnifying glass
Culture your expected fungi on PDA or on your expected media. Incubate at 30-34 C for 24 hour at dark condition for first growing fungi or more than two days for slow growing fungi. Observe under microscope and cut your fungal hyphal tip after dichotomous branching or simply you can cut most extended part. Transfer to new plates. this technique you can use also to get rid of bacterial contamination as bacteria is comparatively slow grower.