Looking for a few opinions/suggestions on tires and saddles on the 7.3 FX.

I'm currently running on the stock Bontrager Race-Lite Hard case tires 700x32, but want to do some trail riding here in the future. These tires don't seem to have tread needed for trail riding, so was looking for suggestions on a pair of cyclocross tires to use on trails.

On the flip side, also looking for suggestions for more roadier tires, maybe 700x25 or 700x28 for when I'm commuting. Any suggestions there? Would there be a major difference between 25s vs. 28s?

Finally, looking to maybe upgrade to a more comfortable saddle. I'm a complete noob when it comes to saddles, so any suggestions there would be helpful.

My apologies on if these are duplicate questions, I tried searching but didn't find anything that really applied.

Thanks again!