I'm a little biased, but wanted to let you know that Rhino Seeds (link in my sig) is reputable - and we're based in the UK.

Our homepage has a seedfinder that should help you find the right seed.
I filled in a few things for you and came up with Super Iced Grapefruit by Feminised Seeds and Night Queen by Dutch Passion.

Super Iced Grapefruit is a Diesel/Chronic mix with 650 gr/m2 yields (if you do it just right) and high THC levels.
It's recommended for indoor use, it's beginner friendly and it takes about 8 to 9 weeks of flowering.
The great thing about this one is that it's absolutely guaranteed - no questions asked.
With Feminised Seeds, they'll replace your seeds if they don't work out - even if you screwed it up.

Dutch Passion is one of the most popular breeders out there. They're Night Queen is an Indica with high THC & CBD with 500 gr/m2 yields (again, if you do it right). It's a little more old-school than Grapefruit, but still billed as beginner friendly.

Of course, automatics are always popular with beginners, but you have to be careful to get one that has a good yield and THC levels.

If you need any help narrowing it down, let me know and I'll see if I can help - by the way, check out our Twitter page - we give away seeds on a regular basis as no-strings-attached promotions meaning you don't have to buy anything to win.
I try to post all our free offers under our section of the forum.
cannabis-seeds Reviewed by cannabis-seeds on . First grow, first of many Questions :hippy: alriiiiiite....finally decided to set up an account and start gettin serious bout wanting to grow...i hear this is the place to ask and get some quality information. Ok well my plan in full is to get seeds, rent a house wit a few friends, begin to grow 5 seeds (indoor grow), have a nice time growing, and an even better time smoking! I wont be renting and begining the grow till june but id like to be prepared ;) so my first question is - Where will I get seeds online that can be trusted? Rating: 5