"Will" is fine after "I". Either modal can form the future tense.
Student or Learner
I found the following individual sentence examples for the topic of simple future tense.
1. Danny and I shall buy her a present for Christmas.
2. Jo, Jess and I will carry out our escape plan in two days' time.
I understand that we should put shall after I. Then why they put will on the second example ?
"Will" is much more common in BrE, except in the interrogative.
We will buy her a plant for Christmas.
Shall we buy her a plant for Christmas?
I will get you a puppy for Christmas.
Shall I get you a puppy for Christmas?
In the Irish variant, you'll hear "Will I get you a puppy for Christmas?"
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.