You should be able to find a lens at fairly low cost.
Find a book that explains the process step by step.
The pitfalls i had while learning:
-The negative can overheat and buckle while focussing if I play around too long- Perhaps that is due to my old condensor enlarger.
- The paper can get pre-exposed on one edge when removing sheets from the pack, so now I remove a sheet more carefully, in the dark, and keep the bag folded around.
-Cut a sheet into strips to use for graduated test exposures. I now do it mostly each exposure, more effort but it saves time and paper over the session.
I was told that pearl paper was easiest to learn on and I have used it ( Ilford Multigrade) ever since.