sentences OK?

Firstly decide whether you want to go further study.
Secondly verify your financial capability to support your study.
Thirdly choose the right institution for your study.
Are these sentences OK?

Firstly, decide whether you want to follow a course of further study.
Secondly, verify that you are financially capable of supporting your study.
Thirdly, choose the right institution.

The 'firstly, secondly, thirdly… structure is correct, but sounds stilted.

Beeesneees,
Since my structure sounds stilted, please rephrase the sentences with proper form.
Thanks.

Beeesneees,
Your kind help is solicited.
Thanks.

Twi exampes of many possible variations:
First of all, decide whether you want to follow a course of further study.
Then, verify that you are financially capable of supporting your study.
Finally, choose the right institution.

First of all, decide whether you want to follow a course of further study.
If you are certain you want to pursue further study, verify that you are financially capable of supporting your study, then choose the right institution.