How do you get to school? do you drive or walk? Walking to and from school is a good way to get your child more active. if you drive then park away from the school (be easier too) and walk the rest. same if you take the bus, get off a few stops early and walk. If you pass a park on the way home stop off for a run around, or a play on the swings.
You do not have to pay for special activities for your child to encourage them to exercise, but remember that the nights will be drawing in soon, so schedule some family walks at the weekend to make sure your child is getting out and about in the daylight.
Join your local library, encourage your child to enjoy books by reading to them every night, read good quality picture books, talk to your child about the stories and pictures.
If English is not your first language then speak to your child in your first language, your child will learn English at school, but what you can offer is a good language role model in your first language, the learning your child gets from you in your first language will transfer to English, and having strong first language skills will actually support their English development.