paypal integration with omnipay laravel 5

I need to integrate paypal in my website . I should have 3 payments types 3 month with $100 dollar, 6 month with $400 dollar and i year with $1000.I have use omnipay. In my composer.json i have

"omnipay/omnipay": "~2.0",and
        "omnipay/paypal": "~2.0" 

installed.

What next i should do now ? I need to make Html form for above payment types or paypal provide it. Also i need to store user id,payment amount in database.How can i do this,please help me. I have never integrated paypal

via Chebli Mohamed