Flower Fewer is lightweight modpack, centered around Botania and Thaumcraft. It's probably the best way to learn both mods while having fun with Biomes O' Plenty and Chisel. If you are just starting with modded Minecraft, this modpack is perfect for you!

Botania and Thaumcraft both have ingame guides (Lexica Botania and Thaumonomicon) and all gameplay information is available in there. To find different decoration blocks, use NEI (shorter for NotEnoughItems).

Content mods
Botania (tech mod that looks like magic mod)
Thaumcraft (magic mod that can be played like tech mod)
Better Storage (bigger chests, creeper proof chests, locked chests, you name it)
Storage Drawers (chests with huge storage capacity but each for only one item)
Biomes O' Plenty (new amazing biomes, plants and landscapes)
JourneyMap (allows you to create waypoints and use minimap)

Decoration mods
Botanical Addons (mostly decorative addon for Botania)
Chisel 2 (mod that adds tons of new decorative blocks)
Storage Drawers: Biomes O' Plenty (drawers can be crafted from wood added by new Biomes)

Storage Drawers: Misc Pack (drawers can be crafted from wood added by Botania)

Utility mods

Thaumcraft Node Tracker (tracks all discovered nodes their stats)
Thaumic Exploration (adds a bunch of useful items to Thaumcraft)
Thaumic Warden (Thaumcraft armour if you don't like armour from Botania)

Auto Sapling (saplings are replanted instead of despawned after 5 minutes)
Waterproof (redstone and torches can't be destroyed by water)
Morpheus (better sleeping system for servers)
ChickenChunks (adds chunk loader, perfect for multiplayer)

Visual mods
Inventory Tweaks (better inventory sorting)
Baby Animals Model Swapper (new models for baby animals)
Neat (it's easier to see how much health mobs have)
NotEnoughItems (displays all available recipes and blocks)
Waila (tells you what you are looking at)
Waila Plugins (integration with other content mods)
Wawla (more waila information)
BetterFps (increases your fps, I would still recommend installing Optifine)