I think the main thing to know at your current level is simply knowing when to be aggressive, and when to be passive.
A lot of people that play aggressive supports like Ali don't fully take into account the situation when they initiate. Sometimes their partner or their team is not in position to even follow up (or aware that they should be), which essentially leaves you a sitting duck. Sometimes they badly misjudge what the enemy is capable of doing in response and get themselves or their partners killed for no reason.
It's okay to play passively. Ali has one of the best lane sustain spells in the game, so you can simply bide your time and wait if need be.
Also, learn when it's good to do the headbutt to pulverize combo, and when you want to flash out, pulverize and then headbutt someone back to your partner. The former is better for some quick harrass, but the latter is MUCH better for kill attempts as it isolates him from his team mates and puts him further from his tower. You may not need to do the latter much, but keep it in mind anyway.
So yeah, mostly you just need to learn the capabilities of your partner and your opponents, and make sure that your partner is in position and paying attention. The paying attention part gets better as you get more and more experienced team mates as your level rises. The in position part relies on you.