Language

 Here is a video with common words and phrases in both English and Welsh. It is over an hour long, but you can scrub through and find the section you want to work on:

Here is a word frequency list for Welsh (link), as well as grammar rules (link). 

This link will take you to a Welsh grammar primer produced by BBC (PDF).

Common Welsh Phrases

Bore da	[borr-eh dah]	Good morning
P’nawn da	[p-noun dah]	Good afternoon
Noswaith dda	[noss-why-th tha]	Good evening
Nos da	[noss dah]	Good night
Shw’mae (South Wales)	[shoe-my]	Hi / Alright?
Su’mae (North Wales)	[See-my]	Hi / Alright?
Shwt ŷch chi? (South Wales)	[Should ee chee]	How are you?
Sut dach chi? (North Wales)	[Seat dah-ch chee]	How are you?
Ble mae…	[blair my]	Where is…
Diolch	[dee-ol-ch]	Thank you
Diolch yn fawr	[dee-ol-ch]	Thank you very much
Croeso	[croy-so]	Welcome / you’re welcome
Ga i	[gah ee]	Can I have / May I?
Esgusodwch fi	[ess-giss-odd-ooch vee]	Excuse me
Ty bach	[tee bach]	Toilet (lit. Little house)
Oes …… yma?	[oys ……. umm-ah]	Is there a …… here?
Coffi	[coffee]	Coffee
Te	[teh]	Tea
Llaeth	[ll-aye-th]	Milk
Siwgwr	[shoo-goor]	Sugar

(From http://acen.co.uk/en/the-welsh-language/useful-welsh-phrases/)