Tell Splits what you're training for. It lays out the weeks; you run them; it adjusts as you go.
Your longest recent run, or how far you can go without stopping. New to running? Enter 0 — we'll start you gently, with a long run of about 2 km in week 1.
Days a week you can realistically run. 3 is a good start; more days build fitness faster and let the plan go further. (6 or 7 days is six runs and a rest day.)