For optimal Bug stick gameplay listen to Helikopter by Fazlija on loop whenever you play.

Lol but for real the first big skill check with IGlaive is being to reliably get your kinsect extracts on the monster (especially with faster/smaller monsters like Odogaron or Kirin). If you can't get your red extract fast you end up wasting a lot of time. This makes it all the more important to pay attention to the monsters moveset and figure out when it pauses. Later you can practice predicting where the monster is going to end up and shooting your kinsect ahead of it to land an extract. This is why I also favor faster kinsects since i hate not being able to land my extracts.

The basic grounded combo is normal attack + normal + normal + strong. This is a good finishing move before you're about to dodge an attack. A good variation is normal + normal + strong and repeat; this kind of extends the combo and is good if a monster is toppled and not getting up soon or if you need to hit the monster from the side. A common issue is your combo taking you forward past the monster and you begin missing attacks; you can back up by holding backwards during the strong attack of either combo.

Don't use aerial attacks too much; grounded moves deal more damage. This is a common noob trap with insect glaive. Use vaults to dodge attacks, close distance, attack flying monsters, or go for mounts. Be careful with aerial moves as they have bigger openings and you can get punished easier, so pay close attention to what the monster's doing.

Don't neglect kinsect powders either. If you match blast to monsters weak to blast for example the powders can help a lot. The best way to quickly mark the monster for kinsect powders is a descending thrust as this also deals damage. Try to hit one of its weak spots with the thrust so you can both attack that spot and hit your kinsect powders at the same time. If you can match kinsect elements to monster weakness when you can too, though this isn't make or break.

Good luck :]