Conversations

'anda' is use for formal conversation or when you talk to someone older than you. If you use 'anda' (formal), you should use formal word for the whole sentence. So instead of 'membantuku' (membantu aku), you should use 'saya'. If you use 'membantuku' (informal) then you need to use 'kamu' (informal)

I want to practice my Indonesian, both writing and speaking. - Saya inging latihan ingin melatih bahasa Indonesia saya, kedua baik berbicara dan maupun menulis.
Maybe I can visit you next week? - Mungkin saya bisa mengunjungimu minggu depan? mungkin saya bisa mengunjungi anda minggu depan?/mungkin aku bisa mengunjungimu minggu depan?
Whenever you want / it suits you. - Kapanpun anda mau.
You don't have to if you it doesn't suit you. - Anda tidak harus jika anda tidak punya waktu./ jika waktunya tidak sesuai dengan anda
We can meet a different time. - Kami bisa bertemu berbeda waktu di waktu yang berbeda.
Don't tell my mom we practice Indonesian, okay? - Jangan bilang mamaku kita latihan bahasa Indonesia iya ya.
I can't hear you very well. - Saya tidak mendangarmu bisa mendengarmu dengan baik.
Call me (back) when you can. - Kamu meneleponku Hubungi saya (kembali) ketika anda biasa. bisa.
The connection is very bad. - Koneksinya sangat buruk.
Please, can you repeat? - Tonlong, bisakah anda bilang lagi? Bisakah anda tolong ulangi/mengulanginya lagi?/Bisakah anda ulangi/mengulanginya lagi?
My phone is almost dead. - Telepon saya hampir mati.
I need to charge my phone. -Saya membutuh perlu mengisi ulang baterai telepon saya.

Last question, I got a response that says "tidak la" with a tumb up icon. Does that mean something like "No, I won't" when asking not to do something. I am not familiar with la.

'la' is like dialect particle, as you may know Indonesian has many ethnic, so sometimes dialect can influence how we talk. It's hard to explain what's the meaning of 'la' in "tidak la". "tidak la" can just mean 'no' or it can mean 'no, I'm just kidding' or it can mean other things, I'm not really sure because I don't know the conversation.

Thank you!

Sorry for my bad English. I hope you can understand what I explain. I correct your not your note here instead on the question because it's easier to make a correction here in notebook. If you have need more help in learning Bahasa Indonesia, I'd be happy if I can help you. Semangat! :)