Given you have extra length in the garage the best option is for you to run the benching along the back wall and put the tambour units between the window openings. As they are for storage and have the sliding openings you do not need to allow extra space for door clearance.
Initially I would have said to run it along the wall with the windows in. However, I think this reduces your width too much for parking vehicles and working. It is better to use the extra depth you have designed in.
Use some graph paper to work out a layout that fits everything in. This will then tell you where the sockets need to go. Sockets near to the door opening are a good idea & also make some provision for weather proof external sockets with integrated rcd's for use of tools etc outside.
I presume the garage will have it's own DB? I would imagine the load from the welder is reasonably heavy. I would put in a dedicated circuit just for that & use cooker cable to the dedicated socket. Use of the cooker cable may be helpful in future if you decide to turn the garage into a granny flat/dwelling house as you will not have to retro fit it or the separate breaker. You will just have to terminate into the appropriate local isolator & cooker connector.
I don't know how you plan to finish the interior but in my last garage, all sockets were surface mounted & I had white pvc round conduit running between them. I also used singles (individual cable as opposed to twin & earth) to wire it all up. It was a shed load easier to pull the singles through the conduit than 2.5mm twin & earth cable! I used the MK metalclad range of sockets and light switches.
If the conduit doesn't appeal visually then you could use 2.5mm twin & earth FP200 fire cable. You would need to buy the glands for the socket back boxes and the 'P' clips to secure the cable to the wall but IMHO it does give a very neat & professional looking install especially when compared to the square/rectangular snap lid trunking.
Of course if you really wanted to achieve an industrial look you could opt for proper galvanised conduit but that would be a load of work & heavy on the wallet.

In terms of lighting, the general consensus is the more the better

Plenty over the workbench & machinery. If you end up using flourescents please ensure you put a twin fitting above any fixed rotating machinery. This will cancel out the strobe effect that is possible when using a single fitting. It is also a good idea to make the rows of lighting individually switchable, that way you can only have on what you need.
I can't suggest any make or model of fitting as the style & size is up to you & is again determined by how you intend to finish the garage ceiling. Pop down to your local electrical wholesaler & see what he has to offer. Most will carry a number of brands and will have catalogues for you to take home & peruse. Some of the GU10 (mains rated) LED spotlights now provide decent lighting and are a fraction of the cost to run compared to the standard 35/50W lamps. Personally I would stay away from the MR10 (12V) spots as the transformers always end up giving grief.
If you intend installing wall cabinets above the bench and they are repurposed kitchen ones, you can always install the under pelmet lighting for really good illumination of your work surface.