I feel that Heisig is for… N3/N2 and above; not for people with beginner Japanese. To earn maximal profit from RTK, you have finish it, not just 500 or something, like WaniKani, because it is not sorted by School Grades.
About how to study, instead of studying just keywords, make sure you know all aspects of Kanji, eventually meaning (as in www.kanjipedia.jp not just Keyword), of course.
Also, RTK is better than WaniKani for writing.
But you have to know Shape->Some reading->Meaning->Associated vocabs->All common readings, respectively. Kanji-in-the-wild learning pattern (outside WaniKani)