this, i used to play zerg in sc2, i was only gold but it kind of transfers over
practice practice practice, and learn to be nice so people dont report you and you have to deal with peruvians, who are naturally arachnophobic
if you arent stomping, then your priority should be getting lvl 25 as soon as possible. if youre stomping a lane, EXPECT THE ENEMY TEAM TO REACT AND CAMP. try to get your teammates to do shit elsewhere on the map because you can stop anybody by pushing by just getting to the creepwave before it catches up with them. just be safe and use your spiders.
as for laning, always start with 2 sentry wards. you dont want those fuckers pushing you out of your web. if you cant get cs, then that's okay, just save for your soul ring and you can build up an army then go rice the lane then jungle.
standard build is soul ring rush, then treads or phaseboots. i love phaseboots to outrun/catch up to people, because once you get on them your auto attacks will slow them and you'll kill them easily.
orchid is another important item, as well as bkb. after that, mkb is probably the best pure dps option with her innate attack speed from her 20 talent.
you can do whatever you feel like after orchid bkb tho, butterfly works, echo sabre is fine i guess but i hate that item, silver edge for pesky axe/bristleback/sven players, fuck it go dagon
learn to micro, here's a few tips and tricks:
1- if you're laning against an enemy that can kill your family in one spell, split your spiders up and use a group about the size of a quarter of your whole brood to bait it out, then when that's out they'll be confident and you can go in and get a kill and they cant do shit.
2- use your spiders to scout, just a single one. often times i don't split jungle with my spiders because you need dat exp to get 25 badly and get +8 max webs
3- use like 2 spiders to cancel blink daggers on people so they cant jump on you. post is too long, here's a game i just did