How fit will i get answers from people with experience please?

im 13 my birthday is september 16th im probably halfway through puberty i way 160 and are 5' 6' to 5'7" im certain i have more fat than muscle but don't know the ration summer is in about 8 weeks now during summer(except on vacation which will be about 2 weeks of summer) i will work out running maybe a half a mile roller skating at least three miles and doing 25 push ups and 50sit-ups and also lift some weight(mostly for my arms) i know i wont become god and have abs but how fit will i get if i do these thing everyday