I would NOT suggest Shaco at all. He's probably the hardest champion in the game to play. Anyway, before starting the game, in champion select, you need to take a close look at your team composition before picking Nidalee.
Things Nidalee wants on her team
Crowd control (especially on solo laners). Example: Renekton top, Ekko mid, Leona support. If her teammates do not have CC, she will not be able to gank early on and will be relegated mostly to farming until mid-game.
Teams with a large mid-game power spike. Usually, champions with ability to make and/or follow up on pick-offs go hand in hand with Nidalee and her cougar form's execute. Some examples would be Morgana, Ashe, and the champs listed above.
A strong front line. Nidalee isn't a tank, she isn't meant to be one. She is an assassin; she goes in and kills a primary target while the tanks, bruisers and the like serve as a distraction. She is what is known as a "carry-jungler", very much unlike Nunu.
Jungle build
Start Machete, a Health Potion, and a Mana Potion (Nidalee can heal herself). The choice of trinket is up to you but I personally prefer Sweeping Lens in most cases.
As for the jungle item that you buy on first back, the preferred choice is Ranger's Trailblazer for clearing ease and HP/mana sustain, but you can switch to Stalker's Blade later on to make your executions and pick-offs more effective. The rest is basically the same as standard AP Nidalee but with the Magus enchantment. That is the only viable jungle enchantment on Nidalee; any other enchantment and you'll become next to useless after two items. Now for clearing the jungle. For first time jungle Nidalee players, the first clear can be a little daunting. It doesn't have to be. Just remember this:
Take Javelin Toss/Takedown (Q) at level 1, Primal Surge/Swipe (E) at level 2, then Bushwhack/Pounce (W) at level 3. Max Q first after that.
Toss your spear at the monster from max range to do the most damage to it. This will make clearing the camp easier.
Spearing or Bushwhacking camps from across walls allows you to jump to them much quicker. Do this to speed up clears and escape bad situations.
As a ranged champion, Nidalee can play this to her advantage by buying herself some time before the melee monsters finally reach her.
Keep switching between human and cougar forms so that you can keep using all of your abilities as they come off cooldown.
Remember that the attack speed bonus from Primal Surge carries over to cougar form, and that Takedown resets the auto-attack timer.
On The Prowl
If you wanna gank, make sure you attempt to get the laner's attention by pinging on the enemy champion. If you've done it right something like this should appear:
Now that you've signalled your intention, there are some things you need to be wary of:
Where the attention of your laner is at, and the CC they possess (check at 6 if their ult is up)
The possibility of your route being warded by the enemy (they will usually back off if they see you)
The location of the enemy jungler
The position of the target (near his tower? Behind minions?)
The enemy's capabilities (Can they CC you? Block or dodge your abilities? Strengthen their defenses? Are they fed?)
The possibility (or lack thereof) of losing key objectives elsewhere if you commit
If you can't hit the enemy with your first spear, the gank will often end in failure, so take these factors into consideration, and sweep river brush if you can.
Ganking
If your laner has the CC, it can be beneficial to let them make the first move.
Whatever the case, if you think you'reready, chuck the spear towards where you think they're headed.
If it lands, go in ASAP assuming it's safe and do your thing. You may need to back off if the enemy jungler says hi (countergank), if he's close to tower, or you are not getting followup.
If it doesn't land, assess your options. You may still be able to go in depending on your laner's lockdown, so consider that option. Otherwise, the best choice is often to retreat - don't bother taxing because that's when you'll get counterganked. Don't take that risk.
Outside of Laning Phase
This AP assassin is actually an easy champion to play when she isn't trying to pull off early-game ganks or struggling through her first clear. You'll get the gist of it after about three or four games. Remember to Bushwhack key brushes, heal your ADC in teamfights, keep key spots warded if your support doesn't, and have fun!