Gaining your first bitcoin can be done easily by free methods, it will take some time of course but its also worth it.
I would recommend you to do signature campaigns because they are easy and without risks, they only require you some spare time.
Signature campaigns are indeed one of the best things you can do to make without risks some bitcoin although I think it will take a lot of time to gain one bitcoin to be honest.
Definitely you can earn with signature campaigns there are high paying signature campaigns but they are requiring high ranks account, so if you don't have high rank account for their requirements, you can invest in buying account, high rank account.
More than 1 bitcoin you can earn for more or less than 1 year.