Hi and how exciting!! Are you looking for training pants, which are usually not very absorbent, or something for overnight?
If trainers, I'd say skip them - it can be confusing to the child if some undies are OK to pee in, others are not. We just used normal cloth undies, did laundry when there were accidents, and it went fine. I have known others to do this - and that way you can save your $$ for the overnight stuff. IME the overnight stuff is a longer phase...
For overnight, I've seen others recommend Mother of Eden and Drymids. We use Motherease bedwetters which are very durable & haven't leaked (though they have overflowed). I also tried Happy Heiny trainers but they leaked unless I got the stuffing juuust right. And some Toddling Tots but I am not sure she's still making them. HTH