Welcome to the site and congrats on your new boat!
Electronics is not a simple issue and there are many decisions:
o budget
o needs
o brands
o setup
There has been much change inb the past few years. I have the first generation of networked systems and 5 years later there are many of these now. It is very hard to be specific without more info but here are some general guidelines.
o integrated systems are the way to go
o major brands in no order are Raymarine, Garmin, Furuno, Simrad
o consider radar as they are cheap thes days and very useful
o if you do any serious fishing get an autopilot (Simrad and Garmin lead)
o a good VHF radio and HIGH quality antenna is step #1 (Icom 504, SH extension 5" speaker, Digital or Shakespear galaxy antenna)
o find a KNOWLEDGABLE installer in your area and get opinions. Beware of those you sell only a single brand. Best advice is from experience and those who work with multiple vendors.
When I rigged Megabytes in Fall 2003, I got the best, state of the art which was available regardless of price. If I rigged a boat today there are more choices so I'd again do lots of research. From what I know I'd lean towards a Garmin plotter and a Furuno Navnet for the radar and sounder.
For radio I am die hard Icom. I can hear boats 30nm and USCG over 100nm away. I top shelf antenna is key and not very expensive.
I also recommend a ACR EPIRB if you venture any distance offshore.
Good luck.