I know it can be overwhelming at first.
If it seems too expensive, or too overwhelming, you can always go low tech at first and then expand on it later on.
What I did with my first 55 was get a fixture that was 2x65 watt power compacts and I ran 50/50 bulbs in it which gave me a med-low light level so I didn't need CO2
and I was able to grow a variety of plants in regular gravel with root tabs and virtually no other ferts as my water is hard enough to take care of a lot of trace elements with water changes. I stuck mostly with crypts and stems and it worked well.
Growth is also slower on lower light tanks so you don't have to trim as much.
Definitely do your homework and have a plan, that is the best way to succeed but we are here to help so don't feel like you have to pioneer things. I would have never gone planted if it werent for all the resources I found here at AA.
And I got plenty of advice from people in this wonderful community.
Best wishes to you!