https://1000mostcommonwords.com/1000-most-common-spanish-words/ I liked this link.

https://www.pdfdrive.com/2000-most-common-spanish-words-in-context-get-fluent-increase-your-spanish-vocabulary-with-2000-spanish-phrases-e200485062.html it's 2000 but they are taken from the Spanish frequency dictionary, so they should be really useful. Oh, I didn't see the infinitives part, so maybe less so.

Sure! But first you need to understand the rules! It could be easier to learn. there are difference when verb finish in -ar -er -ir. I send you a link about it. https://www.spanish.cl/Grammar/Notes/Presente_Indicativo.htm You can find more exercise in my profile. I'll be very pleasure to help you, if you have any question just write me.