Testing a trading algorithm

Hi everyone, I am new to quantitative finance and would appreciate your help in this particular matter.

I've become proficient with python and have acquainted myself with the basics of quant finance and would now like to develop algo trading models and test them in virtual (and real) stock market simulations. Where should I start if I want to deploy my models in easy to use and beginner friendly programs (paper trading)?

Thanks a lot for your help!