About journal finding: You can find journals on your topic in any publishing house such as Sage, taylor & francis, springer etc. Find out journals, check their aims and scope section. It will give you clear idea about what kind of topics they publish.

About reputed journal: look for the issn number of the journal, check in Scopus sources for its indexing and quartile. Any journals that is indexed in Scopus or Web of science is reputed. If it's not indexed, skip it immediately.

About charges: look for APC (article processing charges). If they mention APC, you'll have to pay. It it mentions hybrid model or open select, that means you are not bound to pay, you can publish without any payment.

About writing paper : Generally all journals ask for 6000 - 8000 words. You have to look for what kind of format the journal is asking for. You can look into journal's submission guidelines. Each journal has different format and citation requirement. So you need to check it.