Help with entering data in textbox & checkbox for database

I'm new to creating databases using excel and have been asked to continue work on one that has been started by someone else with some knowledge of this.

User input screen has been created and some coding has been done. I understand the coding which is attached to the "enter hours" button, which is used to enter the user input into the database.

I need help with the following:
1) how to allow user to input information into text box and checkbox
2) how to ensure only numeric input is allowed in textbox

I have very little knowledge of VBA but have been reading online forums and help files to learn what I can. Any help would be greatly appreciated.

Attached is a copy of the file. Thank you.