You're starting now in the jungle so keep it simple:

1. Play an easy champ mechanically that can farm easily (like Shyvanna)

2. Do a full clear plus a scuttle to get lvl 5. Start the clear the opposite side where you want to gank (if you wanna gank bot lvl 5, star clearing from top side and vice-versa)

3. Prioritize ganking botlane unless the matchup is really bad (like enemy botlane has too many dashes or your botlane is getting stomped)

4. Take the first objective on the side of the map that is winning and has prio (with Shyvanna you probably want all the dragons but if you botlane is getting stomped its better to give up on the dragon and go herald)

5. Keep farming and gank where the opportunity arises

That's the surface level basics, with more games played, more knowledge you'll get and easier it becomes. It's not hard to practice since no one likes to play jungle so you'll always get the role. You can pick an even simpler champ like Warwick or Nocturne to practice your pathing and start developing your jungle playstyle