<Help> Build a neural networks model

link for the training set: 42.6 KB file on MEGA
link for the test set: 23.9 KB file on MEGA

Given that the target variable of the above set is "Property", I have just perfromed the one hot encode the factor variable.
My task is to build a neural networks model on the training data. Tune the model to find a good activation function and architecture. Test at least 5 different combinations of architecture and activation functions. Use the test set to check for overfitting. Use out of sample R squared to determine how well your model predicts crime rates.
However, I dont have any idea how to write the R code in order to achieve the objective. May I ask if someone can help me on that please?