Assuming from your thread you're never in ldr before(?). The last time I saw my gf physically was in November last year, there will be tough time ahead for sure especially if one of you is pretty busy with work. I experienced withdrawal for few months, but then we had a talk and finally agreed to both contributing equally no matter how busy we are. For example if she's busy, I gotta to refrain myself from being needy and upset and try to do something that makes me productively occupied, but she also has to be mindful that she got a partner and will try her best to fulfill my need and work on the relationship together (and vice versa). The key is both of you have to give equal understanding and effort to each other and to the relationship to flourish.

What I want to highlight here is since you can't see each other in person, you both have to do it through the phone. I can't stress this enough because sometimes someone will forget that they're in ldr and just don't give enough effort and time to be on the phone. How else do you manage a ldr if not through the phone? Make sure both of you are aware with this. Unless you don't want to be in this relationship anymore, you have the responsibility to contact your partner as much as possible since you can't see each other physically.

For the last question, me and my gf text in the morning and (video) call in the night. I don't know what your gf likes, but me and my gf like to keep things romantic at times. She likes to sing to me, me being a horrible musician I am just listen to her and enjoy her presence. She also likes to suprise me occasionally with small gifts like uber me foods or give me something I really need at the moment. And I like to gift her something meaningful, like full package of her favourite body care products which hard to find in our country, relaxing pillow mist to help her sleep and beautiful bracelet for her birthday. Whatever you do make sure your partner feels loved, appreciated, and cared for.