Hi, welcome to CS.
I have been shooting with Nikon equipment for over 30+ years and would like to offer my personal suggestions.
1) Don't go out and spend your hard earned money on stuff before you really understand your needs. Yes lenses, tripods or monopods, etc. are stuff that we're gonna need but just hold on to your purchases first.
2) Instead, go check on online forums, youtubes, googles, meet up with fellow shooters, talk, share, ask questions. Go out. Join some shoots and learn how to maximise whatever you already have.
3) Master your camera settings from both technical and creative aspects.
4) Try and take better pictures with whatever you have first.
5) When you've done something like 3K or 5K or 10K on your shutter count, you will get a feel of what you like and don't like, and what you're gonna need.
6) At that point, you can slowly look at acquiring more 'gadgets'
Final point: If you rush out to buy purely 'entry level' stuff, you might find that, after a short while, you're 'itching' for more pro quality stuff. If you buy pro quality stuff now, you risk spending lots of $$$ that you eventually might not use. So go easy.
Feel free to contact me offline if you wish. My email
sf_kang@pacific.net.sg