ok youre a bit light for your height. if you want a lean model look with a lot of strength, aim for a lean 170lb-ish weight. or about 80kg. 150 at 5'10 is too small of a frame to have any real strength
with that said, 5/3/1 is too advanced for your level. dont take it the wrong way, 5/3/1 has a very slow progression rate, and you can do a lot better at where you stand now. 5/3/1 is oriented toward people with huge humbers that have a very hard time progressing.
with your squat weight, id suggest going into the stronglifts 5x5 routine. its a powerlifting routine with incredibly fast progression, especially the squat. once youre repping around 115-135kg in the squat, then its time to graduate to an intermediate routine such as madcows, texas method, or DC training. the progression on those is slower than stronglifts, but still faster than 5/3/1
and make sure you eat enough. at first, dont be afrfaid to go over your goal weight, you can always slim it down later, or just increase your weight goal and get bigger. eventually, youll want to find the right calorie intake where you gain weight relatively slowly, but maintain progression in your lifts.
if you havnt already, youtube "so you think you can squat" and "so you think you can bench" and watch all 5-6 episodes of each. theyre around 30 minutes total each, and will teach you perfect powerlifting form for the squat and bench press. the squat one in particular is one of the greatest videos to ever go on youtube
