If it were me, from where you are.
1. I'd say it was probably a safety switch that stopped it running last time - PTO, HST, seat are the likely culprits. The reason for thinking this is that you had dash lights but no crank - that's exactly what a safety switch does.
2. I'd say that you now have a different problem. You have no dash lights at all, which is different than what you had before.
3. For no dash lights, there are a few places I'd look.
a. Does the battery have charge? I know, it was just working and it's new, but maybe it shorted out or you left something on or whatever. If you have a multimeter, check you've got a bit more than 12v. Without a multimeter, then you need a light or something else that runs off 12v that you can connect to the battery posts and just see if it has any power at all. Dash lights don't take a lot of power, if the battery has power and the dash lights aren't going, then we're looking for a fuse or a loose connection
b. Check the fuses. The big one
@North Idaho Wolfman pointed to. And then all the fuses in the fuse box (easy enough to pull them and look at them, put them back). Use pliers to pull them, do them one at a time so you don't mix them up. If you have a multimeter I'd also check resistance across them (the ohms measure). Sometimes they're blown and it's not easy to see. You're looking for something close to zero, if it's infinite resistance then it's blown.
c. Check every connection. Easiest to do by just following the wires and put your multi-meter at each spot, check if you've got voltage. When you find a spot that doesn't have voltage, you have a loose connection between where you last checked and there. This is an easy thing to do when you pull the fuses - you can look for voltage in the fuse holder while it's out. You should be able to use the tractor chassis as you're negative when looking for voltage, but it has to be unpainted metal somewhere (painted metal won't conduct). I usually end up using a bolt head. (And check that you have zero resistance between the tractor chassis and the negative terminal on the battery - if the negative terminal is not connected well then nothing will be earthed to the chassis at all)