It would be nice if beginners can qualify for signature campaigns in less time.
Are there any tips or good practices that can help beginners to start running signature campaigns early?
example - buying senior member profiles can be a way to start early
Yes,you can always buy let's say senior member account,but it will not be as great as you would make it by your own.
It takes some time indeed,to get a decent rank here,but its not so long

You should be online everyday actually,and remember you really need to write quality posts.