It is important that you do not arrange to travel to the UK until you have received your decision from UK Visas and Immigration (UKVI) and received confirmation that all safeguarding checks have been completed on your sponsor (if travelling on a Homes for Ukraine visa)
Once your decision letter has been received you can start to prepare to make travel arrangements, including where to meet your sponsor, bringing medical devices and medication and bringing personal items from Ukraine to UK, and how to travel when bringing pets from Ukraine to UK.
The charity Reset Homes for Ukraine have put together this guide to Free or Low Cost Travel for Ukrainians